In an ERP QoS BSS using APSD, when is the Power Management subfield of the Frame Control field set to a value of 1?
A.
Only in management frames sent by a non-AP QoS STA immediately prior to entering a low power state (dozing).
B.
On any QoS Data frame sent by the QoS AP subsequent to a PS-Poll frame.
C.
On any frame transmitted by a non-AP QoS STA using APSD.
D.
Only in the PS-Poll frame sent from a STA operating in PS mode.
C
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