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Q8 Single choice

How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

A
The VoIP phone transmits a PS-Poll frame
B
The VoIP phone sets the More Data bit in the MAC Header to 1
C
The VoIP phone transmits a WMM Action frame
D
The VoIP phone transmits a trigger frame, which is a QoS Null frame or a QoS Data frame

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