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GS Paper: GS3

  • How Delhi’s air quality monitors work and why their readings can falter

    INTRODUCTION

    Delhi operates a dense network of 40 Continuous Ambient Air Quality Monitoring Stations (CAAQMS) that serve as automated laboratories tracking eight key pollutants. These stations guide the daily AQI, enable pollution-control measures and emergency responses, and form the backbone of environmental governance. However, recent judicial scrutiny and scientific studies highlight significant gaps in equipment suitability, calibration, meteorological sensitivity, and data reliability, creating a critical governance challenge.

    WHY IN THE NEWS 

    The Supreme Court recently demanded clarity on whether Delhi’s air-quality monitoring equipment is suited to city-specific pollution and meteorological conditions. This scrutiny is significant because Delhi heavily depends on AQI data for health advisories and regulatory actions, yet multiple stations fail to generate adequate, validated data on many days. A CAG report and recent scientific studies show systematic errors, including 30-40% overestimation of PM2.5 under high humidity, raising concerns about the credibility of pollution data itself.

    How Delhi’s Air Quality Monitoring System Functions

    1. CAAQMS Network: Operates 40 automated, temperature-controlled stations functioning as compact laboratories across different city zones.
    2. Regulatory Basis: Functions under CPCB’s 2012 guidelines, which define calibration steps, quality-control procedures, and uniform monitoring standards.
    3. Pollutant Coverage: Tracks eight pollutants, PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃, Pb, ensuring representative citywide measurement.
    4. Instrumentation Setup: Stations contain racks of analysers, pumps, and data loggers, with sampling inlets mounted on masts above the roof to capture ambient air.

    How Pollutants Are Measured Inside the Stations

    1. Beta Attenuation Monitors (BAM): Use beta ray attenuation to measure particulate concentration by assessing signal weakening through collected particulate mass.
    2. Gaseous Pollutant Monitors: Use optical and chemiluminescent methods, depending on pollutant type, to detect gas behaviour under specific wavelengths.
    3. National Standards: Measurements follow NAAQS procedures, including “gravimetric, wet-chemical and automatic instrument-based techniques” ensuring comparable data across India.

    Factors That Distort or Corrupt Monitoring Readings

    1. Equipment Performance: AQI depends on validated data; CPCB requires 16 hours of reliable data per day for at least three pollutants, including PM2.5 or PM10.
    2. System Failures: Calibration lapses, power outages, and extreme weather cause routine station downtime.
    3. CAG Findings: A report tabled in Parliament revealed several stations failed to generate adequate, valid, real-time data, especially for pollutants like lead, Ammonia, etc.
    4. Location-Based Distortions: Stations placed near buildings, trees, or exhaust vents risk skewed results due to poor dispersion.
    5. Meteorological Disruptions: Severe weather disrupts data transmission, reducing continuity in real-time updates.

    What Scientific Studies Reveal About Measurement Accuracy

    1. Variability with Humidity: CSIR–NPL’s 2021 analysis showed PM2.5 measurements vary with RH, particle mass loading, boundary layer height, and ventilation effects.
    2. Overestimation Threshold: When RH > 60%, BAM monitors exhibited 30-40% overestimation of PM2.5 because water absorption artificially increases mass signal attenuation.
    3. High-Pollution Episodes: Dust-heavy conditions can cause a factor up to 5 underestimation, as heavy loading disturbs air beam pathways.
    4. USEPA Insights: Notes that “high filter loading can lead to flow perturbations,” and “excessive particulate accumulation” disrupts instrument stability.
    5. Recommended Corrections: Scientists recommend site-specific correction factors, which were shown to reduce overestimation errors from 46% to under 2%.

    Why This Issue Matters for Governance and Public Health

    1. Policy Dependence on Data: Emergency actions (GRAP stages, school closures, construction bans) rely on AQI accuracy.
    2. Public Health Impact: Misreporting distorts exposure assessments, health risk communication, and hospital preparedness.
    3. Environmental Justice: Vulnerable groups (elderly, children, labourers) depend on reliable alerts for safe mobility.
    4. Accountability: Data reliability determines CPCB, DPCC and state-level regulatory performance.

    CONCLUSION

    Delhi’s air pollution management depends critically on trustworthy, scientifically robust, and well-maintained monitoring infrastructure. While the city has one of India’s largest automatic monitoring networks, recent judicial scrutiny and scientific findings reveal persistent calibration errors, equipment inconsistencies, and meteorological vulnerabilities. Ensuring accuracy requires standardised maintenance, site-specific correction factors, stronger institutional oversight, and resilient instrumentation capable of performing reliably under Delhi’s complex pollution environment.

    PYQ Relevance

    [UPSC 2021] Describe the key points of the revised Global Air Quality Guidelines (AQGs) released by WHO (2021). How are these different from the 2005 update? What changes in India’s National Clean Air Programme are required to achieve these standards?

    Linkage: The question links directly to GS-III themes of environmental pollution, health-based standards, and regulatory capacity. It is highly relevant as India’s NCAP, NAAQS and AQI-based governance must realign with WHO’s stricter 2021 guidelines to ensure credible monitoring, policy effectiveness, and public health protection.

  • Bastar Olympics

    Why in the news? 

    • The Bastar Olympics is a government-led sporting initiative in Chhattisgarh’s Bastar region, an area historically affected by Left-Wing Extremism (LWE).
    • It has become a symbol of normalisation, trust-building, and socio-cultural revival as Maoist influence recedes.

    What are the Bastar Olympics?

    • A regional multi-sport event launched by the Chhattisgarh government.
    • Conducted across all 7 districts of the Bastar region:
      • Bastar, Dantewada, Kanker, Kondagaon, Narayanpur, Sukma, Bijapur.
    • Includes 11 sports:
       Archery, Kabaddi, Athletics, Badminton, Football, Hockey, Karate, Weightlifting, Kho-Kho, Volleyball, Tug-of-war.
    Prelims-Relevant Themes Emerging

    • Internal Security: Platform for reducing alienation in LWE regions.
    • Social Issues: Women’s participation & empowerment.
    • Tribal Affairs: Inclusion of PVTGs, revival of cultural identity.
    • Governance: Last-mile delivery and state presence in remote areas.
    • Sports & Youth: Identification of rural sporting talent.
    Consider the following statements about Particularly Vulnerable Tribal Groups (PVTGs) in India: 

    1. PVTGs reside in 18 States and one Union Territory. 

    2. A stagnant or declining population is one of the criteria for determining PVTG status. 

    3. There are 95 PVTGs officially notified in the country so far. 

    4. Irular and Konda Reddi tribes are included in the list of PVTGs. 

    Which of the statements given above are correct? 

    (a) 1, 2 and 3 

    (b) 2, 3 and 4 

    (c) 1, 2 and 4 

    (d) 1, 3 and 4

  • Ningaloo Reef Mass Coral Mortality 

    Why in the News?

    A new survey in 2025 shows that nearly 70% of corals in Australia’s UNESCO World Heritage–listed Ningaloo Reef have died due to the most intense and prolonged marine heatwave on record.

    About Ningaloo Reef  

    • Located in Western Australia.
    • A UNESCO World Heritage Site.
    • One of the largest fringing reefs in the world (~260 km long).
    • Important for marine biodiversity, supporting whale sharks, turtles, reef sharks, and diverse coral species.

    Extent of Coral Mortality

    • ~70% mortality recorded in latest survey.
    • In eight northern lagoon sites (Osprey → Tantabiddi Sanctuary Zones), mortality >60%.
    • Of 1,600+ corals assessed in March, only ~600 survived by October.

    Species Impact

    • Highly Affected (Dominant Species Lost)

        • Staghorn corals: Acropora tenuis, Acropora millepora and Acropora spicifera
        • Thin birdsnest coral (Seriatopora hystrix).

    • Relatively Resilient

      • Veron’s tube coral (Echinopora ashmorensis)
      • Lesser knob coral (Cyphastrea microphthalma)
    • Structural decline:
      • Dead corals now overgrown by sponges, turf algae, reducing reef stability & biodiversity.

    Broader Ecological Significance

    • Coral reefs support ~1/3 of global marine species.
    • Mass mortality compromises: Fish breeding grounds, Shelter for marine organisms, Coastal protection and Tourism & local economies.

    Widespread Global Coral Stress

    According to the United States National Oceanic and Atmospheric Administration (NOAA):

    • 84.4% of the world’s reef areas experienced bleaching-level heat stress (Jan 2023–Sept 2025).
    • Mass bleaching in 83+ countries.
    • Marine heatwaves in 2023 lasted 4× longer than the long-term average and affected 96% of the world’s oceans.
    The scientific view is that the increase in global temperature should not exceed 2 ∘ C above pre-industrial level. If the global temperature increases beyond 3 ∘ C above the pre-industrial level, what can be its possible impact/impacts on the world? 

    1. Terrestrial biosphere tends toward a net carbon source. 

    2. Widespread coral mortality will occur. 

    3. All the global wetlands will permanently disappear. 

    4. Cultivation of cereals will not be possible anywhere in the world. 

    Select the correct answer using the code given below: 

    (a) 1 only (b) 1 and 2 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 only

  • Sleep Apnea & Parkinson’s Disease 

    Why in the News?

    • A new study published in JAMA Neurology (Nov 24, 2025) found that untreated Obstructive Sleep Apnea (OSA) can nearly double the risk of developing Parkinson’s disease.
    • The study analysed 11 million+ U.S. military veterans’ medical records (1999–2022).
    • Use of CPAP (Continuous Positive Airway Pressure) significantly reduces the elevated risk, making sleep quality a potential neuroprotective factor.

    Key Findings

    • Untreated OSA → ~2× higher likelihood of developing Parkinson’s.
    • CPAP therapy helps maintain oxygen levels → reduces neurodegeneration risk.
    • Repeated oxygen drops during sleep may lead to long-term neuronal stress.
    • Parkinson’s disease risk increases naturally with age, especially >60 years, but untreated OSA further elevates vulnerability.

    About Parkinson’s Disease 

    • A progressive neurodegenerative disorder affecting movement.
    • Caused by loss of dopaminergic neurons in the substantia nigra.
    • Symptoms: tremors, rigidity, bradykinesia, cognitive decline (late stages).
    • No cure; treatments focus on symptom management.

    Prelims Pointers

    • New association identified: OSA ↔ Parkinson’s disease risk.
    • Published in JAMA Neurology.
    • Largest dataset used for this linkage: 11 million veterans.
    • CPAP is not just a sleep device—it may offer neuroprotection.
    • Chronic intermittent hypoxia implicated in neurodegeneration.
    Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition? (2010)

    (a) When inhaled into the human body CO is converted into CO2

    (b) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen

    (c) The inhaled CO destroys the chemical structure of haemoglobin

    (d) The inhaled CO adversely affects the respiratory centre in the brain

    This PYQ is chosen because the core pathological connection linking Sleep Apnea and Parkinson’s disease is the concept of chronic oxygen deprivation (Hypoxia) and its neurodegenerative impact.

  • Aravalli Hills: 90% Lose Protection, FSI Red-Flag Ignored

    Why in the News?

    • On 20 Nov 2025, the Supreme Court approved the government’s definition of Aravalli Hills as any hill 100 m or higher above local ground.
    • Problem: This definition excludes 90% of Aravalli hills, making them open for mining and construction.

    Background

    • The Aravalli Range runs from Delhi to Gujarat through Haryana and Rajasthan.
    • It is oldest fold mountains in India and plays a key role in ecology, dust control, groundwater, and wildlife corridors.
    • In 2024, the SC asked the government to create a uniform Aravalli definition.

    FSI’s Warning

    • Lower hills (20–100 m) act as natural windbreaks, blocking sand and dust from Thar desert.
    • Removing protection risks:
      • Higher air pollution in NCR
      • Loss of wildlife corridors
      • Impact on agriculture and farmer livelihoods
    If there were no Himalayan ranges, what would have been the most likely geographical impact on India? (2010)

    1. Much of the country would experience the cold waves from Siberia. 

    2. Indo-gangetic plain would be devoid of such extensive alluvial soils. 

    3. The pattern of monsoon would be different from what it is at present. 

    Which of the statements given above is/are correct? 

    (a) 1 only 

    (b) 1 and 3 only 

    (c) 2 and 3 only 

    (d) 1, 2 and 3

    The profound geographical and ecological functions of a major mountain range, which directly parallels the catastrophic risks associated with losing the Aravallis.

  • Rupee is Asia’s worst performing currency

    Introduction

    The Indian Rupee has depreciated 4.3% against the US Dollar in 2025, making it Asia’s worst-performing currency. Analysts warn that the INR may slide to ₹90 per USD if the India-US trade deal does not materialise soon. The rupee’s movement is now driven more by global dollar strength than by domestic fundamentals. Persistent capital outflows, a rising trade deficit, U.S. tariffs, and a surge in gold imports have intensified pressure on the domestic currency.

    Why This Matters: Rupee Hits Asia’s Lowest Position

    The rupee’s sharp 4.3% calendar-year depreciation marks one of the steepest declines among Asian currencies. This contrasts sharply with the appreciation seen in much of the Asian currency complex, led by the Chinese Yuan through strong intervention by China’s central bank. The situation is aggravated by India’s record $41.7 billion trade deficit, U.S. tariff shocks, and a gold price spike that spurred a 200% rise in ETF investments. The worsening outlook raises concerns of the rupee breaching ₹90 per USD, a level not previously approached in recent years.

    Drivers Behind the Rupee’s Depreciation

    1. Global Dollar Strength: Dollar appreciation of 3.6% over two months increased pressure on most Asian currencies, including the INR.
    2. External Shocks:
      1. U.S. tariffs on Indian goods directly added stress.
      2. High precious metal prices increased import bills.
    3. Capital Outflows: The current account remains “benign”, but the depreciation is driven by capital flight, not trade fundamentals.
    4. Comparative Weakness: INR weakened more than IDR (2.9%) and PHP (1.3%), marking a distinct underperformance.

    Rupee’s Position Relative to Asian Peers

    1. Underperformance vs. China and Indonesia: Specialists note that while Indonesian Rupiah and Chinese Yuan have depreciated, INR weakened further.
    2. Better Than Structurally Weak Majors: INR still fares better than the Japanese Yen and Korean Won, which face domestic policy constraints.
    3. Asian Currency Complex Trend: Most Asian currencies appreciated, driven by Chinese intervention through PBOC/SAFE signalling.

    Market Movements and Recent Lows

    1. New Lows Recorded: Rupee touched 88.8 per USD on 21 November 2025, breaking earlier RBI-supported levels.
    2. Intraday Weakness: Fell further to 89.66, signalling intense currency-market stress.
    3. Partial Recovery: Rupee recovered to 89.22 by Tuesday, though still significantly weaker on a monthly basis.

    Trade Deficit and Macro Pressures Intensifying Rupee Weakness

    1. Record Trade Deficit: October witnessed a $41.7 billion merchandise trade deficit triggered by tariff hikes.
    2. Gold Import Surge:
      1. Gold imports spiked to $14.72 billion in October.
      2. Gold ETF demand rose by 200% due to soaring global prices.
    3. Twin External Shocks: Tariffs + gold price rise combine with geopolitical uncertainty to pressure the currency.

    Impact of the U.S. Tariffs and Policy Changes

    1. 50% Tariff Imposed by U.S.: Direct impact on India’s export competitiveness, worsening the trade deficit.
    2. Cumulative Effect on Rupee: Tariffs + gold imports + dollar strength + capital outflows create a compounding depreciation effect.
    3. Forward Outlook: Without a trade deal with the U.S., the rupee may breach ₹90 per USD.

    Conclusion

    The rupee’s position as Asia’s worst-performing currency signals deeper stresses in India’s external sector. The depreciation stems from global dollar dominance, tariff shocks, capital outflows, and rising import bills. While partial recoveries occur, the broader trajectory depends heavily on the India-US trade negotiations and management of external vulnerabilities. Ensuring macroeconomic stability will require coordinated steps in trade policy, forex management, and domestic economic resilience.

    PYQ Relevance

    [UPSC 2018] How would the recent phenomena of protectionism and currency manipulations in world trade affect macroeconomic stability of India?

    Linkage: It is directly linked to GS-3: External Sector, as it examines how tariffs and currency moves affect India’s macroeconomic stability. It is relevant for understanding exchange-rate volatility, CAD pressures, and global protectionist trends.

  • Pazhayar River Pollution in Nagercoil

    Why in the News?

    • Rampant sewage discharge into the Pazhayar River in Nagercoil (Tamil Nadu), especially near Ozhuginesary, has raised serious environmental and public health concerns.
    • A 2024 situational report highlighted severe domestic, agricultural, and industrial (rubber processing) pollution in the river.
    • Nagercoil Corporation has initiated steps to seal sewage inlets, but pollution remains widespread.

    About the Pazhayar River

    • A perennial river in Kanniyakumari district, Tamil Nadu.
    • Part of the Kodhayar River Basin, covering 1,646.964 sq km.
    • Basin lies entirely within Tamil Nadu, with a small stretch in Radhapuram (Tirunelveli district).

    Biological Oxygen Demand (BOD) is a standard criterion for (2017)

    (a) Measuring oxygen levels in blood 

    (b) Computing oxygen levels in forest ecosystems 

    (c) Pollution assay in aquatic ecosystems 

    (d) Assessing oxygen levels in high altitude regions

  • Capital Gains Accounts (Second Amendment) Scheme, 2025

    Why in the news? 

    The Ministry of Finance has notified the Capital Gains Accounts (Second Amendment) Scheme, 2025, introducing major changes to the existing Capital Gains Account Scheme (CGAS), 1988. The amendments aim to modernise processes, expand banking access, and increase clarity for taxpayers seeking capital gains exemptions.

    About Capital Gains Account Scheme (CGAS), 1988

    • Launched by the Central Government in 1988.
    • Objective: To help taxpayers claim exemptions on long-term capital gains when reinvestment cannot be completed before the ITR filing due date.
    • Linked mainly to Section 54, 54F, and related provisions of the Income Tax Act.

    Why CGAS is Needed?

    • Exemption requires reinvestment of capital gains within:
      • 2 years (purchase of property)
      • 3 years (construction of property)
    • If this period extends beyond the ITR filing deadline, the taxpayer can temporarily deposit unutilised gains in CGAS to keep the exemption claim valid.

    Important Conditions

    • Deposit must be made before filing Income Tax Return.
    • Money deposited is treated as reinvested for exemption.
    • If the amount is not utilised within the stipulated period, it becomes taxable long-term capital gains in that year.
    • Only long-term capital gains qualify — short-term gains are NOT eligible.

    Who Can Deposit in CGAS?

    • Any person with long-term capital gains, including: Individuals, HUFs, Companies, Firms, Trusts, and Any eligible taxpayer seeking exemption
    • Mainly used by property sellers who need more time to reinvest.

    Capital Gains Accounts (Second Amendment) Scheme, 2025 — Key Changes

    • Expansion of Authorized Banks: Previously limited mostly to Public Sector Banks + IDBI Bank.
      • Now extended to 19 private and small finance banks at all non-rural branches.
    • Non-rural branch condition: Branch must be located in an area with population ≥ 10,000 (2011 Census).
      • Rural branches cannot open CGAS accounts.
    • Wider Definition of Electronic Payments: Electronic deposits can now be made through: Credit cards, Debit cards, Net banking, IMPS, UPI, RTGS, NEFT and BHIM Aadhaar Pay.This modernises the earlier narrow definition of “electronic mode”.
    • Online Closure of CGAS Accounts (From April 1, 2027): Closure requests can be submitted electronically using:
      • Digital Signature (DSC)
      • Electronic Verification Code (EVC)
      • Earlier: Closure only through physical branches.
    • Clarification on Effective Date of Deposit: For cheque/DD/electronic transfers, the date of receipt of the payment instrument along with account application at the Deposit Office is treated as the effective date.Removes ambiguity around last-day deposits for tax exemption.
    • Electronic Statements Permitted: Banks can now issue electronic statements instead of physical passbooks.
      • Aligns CGAS with general digital banking norms.
    •  Extension of CGAS to Section 54GA: CGAS can now be used for exemptions under Section 54GA:

      • Relates to capital gains arising from shifting an industrial undertaking from an urban area to a Special Economic Zone (SEZ).
      • Broadens applicability beyond property-related reinvestments.
    Consider the following statements: (2025)

    I. Capital receipts create a liability or cause a reduction in the assets of the Government. 

    II. Borrowings and disinvestment are capital receipts. 

    III. Interest received on loans creates a liability of the Government. 

    Which of the statements given above are correct? 

    (a) I and II only 

    (b) II and III only 

    (c) I and III only 

    (d) I, II and III

  • African Grey Parrot Trade in India

    Why in the News?

    • A series of RTI applications filed by The Hindu across 19 States/UTs revealed that most State Forest Departments have no records of breeders, pet shops, or ownership registrations for the African Grey Parrot, despite the species being widely available in pet markets.
    • Only Kerala reported receiving 17 breeder licence applications through the PARIVESH portal, exposing major gaps in India’s monitoring of exotic species trade.

    About Species Profile

    • African Grey Parrot (Psittacus erithacus)
    • IUCN Status: Endangered
    • CITES Status: Appendix I (Highest level of protection; commercial international trade highly restricted)
    • WPA 1972: Listed under Schedule IV (post-2022 amendments)

    Legal & Regulatory Framework (India)

    Living Animal Species (Reporting and Registration) Rules, 2024

    • Mandatory registration of all exotic live species on PARIVESH 2.0.
    • Applies to: Pet owners, Pet shops and Breeders.

    Breeders of Species Licence Rules, 2023

    To breed any CITES Appendix I species, an applicant must possess:

    • Breeding Licence from State Chief Wildlife Warden
    • CITES Import Permit
    • DGFT Import Licence Number
    • NOC from State Chief Wildlife Warden prior to import

    Wildlife Protection Act (WPA), 1972

    • African Grey Parrot → Schedule IV
    • Illegal possession/trade punishable under WPA
    With reference to the International Union for Conservation of Nature and Natural Resources (IUCN) and the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which of the following statements is/are correct? (2015)

    (1) IUCN is an organ of the United Nations and CITES is an international agreement between governments. 

    (2) IUCN runs thousands of field projects around the world to better manage natural environments. 

    (3) CITES is legally binding on the States that have joined it, but this Convention does not take the place of national laws. 

    Select the correct answer using the code given below. 

    (a) 1 only 

    (b) 2 and 3 only 

    (c) 1 and 3 only 

    (d) 1, 2 and 3

  • Auramine O Adulteration in Food: A Persistent Food-Safety Challenge in India

    Why in the News?

    • Recent inspections by state food-safety departments and laboratory analyses by academic institutions have once again detected the presence of Auramine O — a banned industrial dye — in sweets, savoury items, and brightly coloured chickpeas sold in public.

    What is Auramine O?

    • A synthetic bright yellow industrial dye.
    • Uses: textiles, leather, printing inks, paper, microbiological staining.
    • Not permitted as food colour in India, USA, EU, or most countries.
    • IARC Classification: Possibly carcinogenic to humans (Group 2B).

    Why is Auramine O Harmful?

    • Toxicological risks:
      • Liver & kidney damage
      • Spleen enlargement
      • Mutagenic effects
      • Potential carcinogenicity
      • Organ lesions even at low doses

    How Does Auramine Enter the Food Chain?

    • Cheap industrial dyes are sold informally in markets.
    • Used by small vendors to mimic:
      • Saffron
      • Turmeric
      • Approved synthetic colours
    • Usage spikes during festivals when brightly coloured sweets/snacks are in demand.
    • Lack of awareness and cost pressure lead to misuse.

    Commonly Adulterated Food Items

    • Bright yellow chickpeas
    • Laddus, peda, halwa
    • Namkeen, mixtures
    • Pickles and condiments

    Regulatory Framework – India

    Food Safety and Standards Act (2006)

    • Defines adulteration.
    • Penalties: fines + imprisonment (for injury/death).

    FSSAI Initiatives

    • Sampling & crackdown during festive seasons.
    • Seizures of illegal dyes and prosecution.
    • New order: bold, larger nutritional information on labels.
    • Awareness programs for:
      • Micro and small enterprises
      • Street vendors

     

    Consider the following statements: (2018)

    1. The Food Safety and Standards Act, 2006 replaced the Prevention of Food Adulteration Act, 1954. 
    2. The Food Safety and Standards Authority of India (FSSAI) is under the charge of Director General of Health Services in the Union Ministry of Health and Family Welfare. 

    Which of the statements given above is/are correct? 

    1. 1 only 
    2. 2 only 
    3. Both 1 and 2 
    4. Neither 1 nor 2