Which two enhancements does WMM provide over basic QoS mode? (Choose two.)

Which two enhancements does WMM provide over basic QoS mode? (Choose two.)
A . U-APSD Power Save is disabled.
B . Each access class shares an 802.11 sequence number. The sequence number allows a low-priority packet to interrupt the retries of a higher-priority packet without overflowing the duplicate checking buffer on the receiving side.
C . For access classes that are configured to allow it, transmitters are qualified to transmit through the normal backoff procedure are allowed to send a set of pending packets during the configured transmit opportunity (a specific number of microseconds)
D . Like 802.11 sequence numbering, WPA/WPA2 replay detection allows low-priority packets to interrupt higher priority retries without signaling a replay on the receiving station.
E . The access point adds each packet’s class of service to the packet’s 802.11 header to be passed to the receiving station.

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Answer: CE