Which two options describe the differences between Layer 2 and Layer 3 QoS? (Select 2)

Which two options describe the differences between Layer 2 and Layer 3 QoS? (Select 2)
A . DSCP priorities are a combination of Class Selector and Drop Precedence.
B . CoS priorities are encoded in the IP header.
C . 802.1P trust-maps only trigger against 802.1Q tagged traffic.
D . DSCP implements seven unique traffic classes for packet queueing.

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Answer: AD