Which of the following is the maximum distance that IrDA can successfully transmit to another IrDA d

Which of the following is the maximum distance that IrDA can successfully transmit to another
IrDA device?

A.
6 feet (1.8 meters)

B.
5 feet (1.5 meters)

C.
4 feet (1.2 meters)

D.
3 feet (0.9 meters)