To have the best possible voice quality and to utilize effectively the available bandwidth, which queuing and compression mechanism need to be used? (Choose two)

A.
class-based weighted fair queuing (CBWFQ)

B.
low latency queuing (LLQ)

C.
priority queuing (PQ) or custom queuing (CQ)

D.
Real-Time Transport Protocol (RTP) header compression

E.
TCP header compression

F.
UDP header compression