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