How does the 7921 decide whether to associate to an AP to avoid over congestion?

A user runs the Cisco Unified Wireless IP Phone 7921 with an AP that runs autonomous Cisco IOS Software. How does the 7921 decide whether to associate to an AP to avoid over congestion?
A. The 7921 monitors the QBSS information element, which includes the Min and Max contention window fields, and uses the information to evaluate contention and channel utilization.
B. The 7921 monitors the QBSS information element, which includes channel load information in the beacon and probe response frames.
C. The 7921 monitors the QBSS information element, which includes EDCF such as queuing on the radio egress port, and uses the information to evaluate AP load and make an association decision.
D. The 7921 monitors the QBSS information element, which includes radio access categories and the Min and Max contention window fields, to evaluate AP load.

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