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What phrase correctly completes the following sentence?

What phrase correctly completes the following sentence?
When using WMM Power Save operation, a wireless client device ______________.

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A.
Alternates between awake and dozing, depending on its need to transmit and receive
information

B.
Enters a low-power radio state until it receives a WMM PS-Poll frame from the AP

C.
Experiences higher throughput and lower latency than when operating in Active mode

D.
Powers down a subset of MIMO radio chains and transmits information at a slower data rate

E.
Buffers frames destined to the low-power AP until the AP wakes its radio and begins beaconing
again

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