Which QoS mechanism for VoIP works with weighted fair queuing (WFQ) and class-based weighted fair queuing (CBWFQ)?

Which QoS mechanism for VoIP works with weighted fair queuing (WFQ) and class-based weighted fair queuing (CBWFQ)?

A.
Header compression

B.
FRF.12

C.
IP RTP Priority and Frame Relay IP RTP Priority

D.
Multilink PPP

E.
RSVP

Explanation: