Which three statements about Cisco Discovery Protocol operations on a Cisco ME3400 switch are true? (Choose three.)

Which three statements about Cisco Discovery Protocol operations on a Cisco ME3400 switch are true? (Choose three.)
A . Cisco Discovery Protocol is enabled by default on NNI ports.
B . Cisco Discovery Protocol is enabled by default on all NNI, ENI, and UNI ports.
C . Cisco Discovery Protocol is disabled by default on ENI ports.
D . Cisco Discovery Protocol is not supported on NNI or ENI ports.
E . Cisco Discovery Protocol is not supported on UNI ports.

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Answer: A,C,E