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.

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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

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