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

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)