Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band.
(b)
Bluetooth is used for wireless local area networks (WLAN) only, whereas Wi-Fi is used for wireless wide area networks (WWAN) only.
(c)
When information is transmitted between two devices using Bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other.
(d)
The statements (a) and (b) given above are correct in this context.
It is a private computer network of an organization where the remote users can transmit encrypted information through the server of the organization.
(b)
It is a computer network across a public internet that provides users access to their organization’s network while maintaining the security of the information transmitted.
(c)
It is a computer network in which users can access a shared pool of computing resources through a service provider.
(d)
None of the statements (a), (b) and (c) given above is the correct description of virtual private networks.