Refer to the exhibit. What is the effect when the switchport priority extend cos 3 command is configured on the switch port interface connected to the IP phone?
Select the best response.
A.
Effectively, the trust boundary has been moved to the PC attached to the IP phone.
B.
The computer is now establishing the CoS value and has effectively become the trust boundary.
C.
The IP phone is enabled to override with a CoS value of 3 the existing CoS marking of the PC attached to the IP phone.
D.
The switch will no longer tag incoming voice packets and will extend the trust boundary to the distribution layer switch.
E.
RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.