What statement about the IEEE 802.11e QoS facility is true?

What statement about the IEEE 802.11e QoS facility is true?
A . 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.
B . Four 802.1p user priorities are mapped to eight 802.11 transmit queues.
C . When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.
D . 802.11 control frames are assigned to the 802.11 EF priority queue.

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Answer: A