Which three descriptions are true? (Choose three.)

A.
The class of service is a parameter that is used for traffic classification and marking at
Layer 2.

B.
The IP precedence is a parameter that is used for traffic classification and marking at
Layer 2.

C.
The differentiated services code point is a parameter that is used for traffic classification
and marking at Layer 2.

D.
The class of service is a parameter that is used for traffic classification and marking at
Layer 3.

E.
The IP precedence is a parameter that is used for traffic classification and marking at
Layer 3.

F.
The differentiated services code point is a parameter that is used for traffic classification
and marking at Layer 3.