Select the processes that makes WMM-PS more efficient than IEEE 802.11 Power Save mode.

A.
Queued frames are transmitted to the QoS STA during an EDCA TXOP burst.

B.
WMM-PS introduces the Wi-Fi Enhanced Power Save (WEPS) throughput enhancement algorithm.

C.
The access point uses Trigger Traffic Indication Maps (TTIMs) for transmit coordination.

D.
Fragmentation thresholds are optimized based on the RF environment, which decreases transmission overhead.

E.
Data frames are used instead of Control frames to request queued data.