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

An access layer switch is configured to extend priority to an IP phone. Cisco Discovery Protocol is enabledon all ports. What are the three possible ways that an IP phone can be instructed to treat the Layer 2 CoSpriority 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

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