Which of these technologies requires line of sight for communication?

1. Bluetooth
2. Wi-fi
3. Near field communication

Select the correct answer using the codes given below.
a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) None of the above

Ans- [D]

Explanation– Line of sight communication is a type of propagation of signals that can transmit and receive data only where transmit and receive stations are in view of each other without any sort of an obstacle between them.

NFC or near field communication, Wifi and Bluetooth don’t require such line of sight. FM radio, microwave and satellite transmission are examples of line-of-sight communication.