Photochemical smog is a resultant of the reaction among
(a)
NO 2 , O 3 and peroxyacetyl nitrate in the prescence of sunlight
(b)
CO 2 , O 2 , and peroxyacetyl nitrate in the presence of sunlight
(c)
CO, CO 2 , and NO 2 at low temperature
(d)
high concentration of NO 2 , O 3 and CO in the evening