What are the three possible ways that an IP phone can be instructed to treat the Layer 2 CoS priority value of the attached PC?

An access layer switch is configured to extend priority to an IP phone. Cisco Discovery Protocol is enabled on all ports. What are the three possible ways that an IP phone can be instructed to treat the Layer 2 CoS priority value of the attached PC? (Choose three.)

A.
trusted IEEE 802.1Q

B.
configured DSCP level

C.
configured CoS level

D.
trusted

E.
configured IEEE 802.1Q

F.
untrusted

Explanation: