Which statement is correct about a WLAN RF medium?

Which statement is correct about a WLAN RF medium?
A . A WLAN RF is a full duplex, contention free medium where each client transmits on a separate channel.
B . A WLAN RF is a half-duplex, shared medium where 802.11 stations contend with each other for access.
C . A WLAN RF is a half-duplex, contention-free medium where the access point polls each station in turn.
D . A WLAN RF is a full-duplex, contention-free medium where 802.11 stations can transmit and receive at the same time.

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Answer: B