What statement about the IEEE 802.11-2016 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. 802.11 control frames are assigned to the 802.11 EF priority queue.

D. When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.