To provide high-quality voice and take advantage of the full voice feature set, which two access layer switches provide support? (Choose two.)

To provide high-quality voice and take advantage of the full voice feature set, which two access layer switches provide support? (Choose two.)
A . Use multiple egress queues to provide priority queuing of RTP voice packet streams and the ability to classify or reclassify traffic and establish a network trust boundary.
B . Deploy RSVP to improve VoIP QoS only where it can have a positive impact on quality and functionality where there is limited bandwidth and frequent network congestion.
C . Map audio and video streams of video calls (AF41 and AF42) to a class-based queue with weighted random early detection.
D . Use 802.1Q trunking and 802.1p for proper treatment of Layer 2 CoS packet marking on ports with phones connected.
E . Implement IP RTP header compression on the serial interface to reduce the bandwidth required per voice call on point-to-point links.

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Answer: AD