Which three descriptions are true? (Choose three.)

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.

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Answer: A,E,F