When compared with legacy Power Save mode, how does WMM-PS improve voice device and
application performance?

A.
WMM-PS identifies and prioritizes incoming VoIP data and delivers it immediately

B.
WMM-PS uses a trigger-and-delivery method that eliminates the need for PS-Poll exchanges

C.
WMM-PS requires scheduled service periods for predictable uplink data delivery.

D.
WMM-PS allows the WLAN transceiver to disable more components when in a low power state.