For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?I. At least three non-overlapping channels are available for transmissions.II. The RTS-CTS mechanism is used for collision detection.III. Unicast frames are ACKed.

For the IEEE 802.11 MAC protocol for wireless communication, which of

1.	For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?I. At least three non-overlapping channels are available for transmissions.II. The RTS-CTS mechanism is used for collision detection.III. Unicast frames are ACKed.
A.	All I, II, and III
B.	I and III only
C.	II and III only
D.	II only
Answer» C. II and III only