Which statement about configuring the Cisco Expressway Control and Cisco Expressway Edge is true?

Which statement about configuring the Cisco Expressway Control and Cisco Expressway Edge is true?
A . You do not need to configure search rules for traversal calls.
B . You need to configure the firewall to allow communication from the Cisco Expressway Edge to the Cisco Expressway Control.
C . The username on the Cisco Expressway Control and Cisco Expressway Edge are local and do not need to match.
D . The Cisco Expressway Edge is the Traversal Server.

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Answer: D