How does a switch port that receives marked traffic from a Cisco IP phone use the mls qos trust cos command?

Refer to the exhibit.

642-427-troubleshooting-cisco-unified-communications_img_203

How does a switch port that receives marked traffic from a Cisco IP phone use the mls qos trust cos command?
A. The CoS setting is modified according to the CoS-to-DSCP map.
B. CoS is used to select the ingress and egress queues.
C. For non-IP packets, the CoS is set to 7 and DSCP-to-CoS mapping is not applied.
D. The DSCP-to-CoS map is applied.

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