Refer to the exhibit.

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.