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Q18 Single choice

What statement about the IEEE 802.11-2016 QoS facility is true?

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

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