Which of the following is an effect of the protocol mechanism QoS with reference to unified communication?

A.
QoS ensures that unified communication video service is delivered as high definition between the unified
communication endpoints.

B.
QoS enables the unified communication traffic compression algorithm to conserve bandwidth across the
WAN.

C.
QoS ensures that real time traffic is not delayed between unified communication endpoints.

D.
QoS prevents any degradation in the voice/video signal quality by tunneling the packets between the unified
communication endpoints.