What are three valid methods of gathering information about an existing data network? (Choose three.)

What are three valid methods of gathering information about an existing data network? (Choose three.)
A . Use organizational input.
B . Perform a traffic analysis.
C . Analyze the user-mapping of a running application.
D . Perform a packet-level audit to verify carrier service guarantees.
E . Perform a network audit to gather more detail about the network.
F . Use reports that analyze the metrics of the customer’s existing network.

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Answer: ABE