Refer&ensp;to&ensp;the&ensp;exhibit.&

Refer to the exhibit. What is the effect on the trust boundary of configuring the command mls qos trust cos on the switch port that is connected to the IP phone？（）

AEffectively the trust boundary has been moved to the IP phone.
BRTP will be used to negotiate aCoS value based upon bandwidth utilization on the link.
CThe switch is rewriting packets it receives from the IP phone and determining theCoS value.
DThe switch will no longer tag incoming voice packets and will trust the distribution layer switch to set theCoS.
EThe host is now establishing theCoS value and has effectively become the trust boundary.

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