Answer is A
Which type of traversal zone?
• If your deployment is for business to business calling, use a traversal zone.
• If your deployment is for mobile and remote access, use a Unified Communications traversal zone
Unified Communications features such as Mobile and Remote Access or Jabber Guest, require a Unified Communications traversal zone connection between the Expressway-C and the Expressway-E.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0/exwy_b_cisco-expressway-administrator-guide/exwy_m_unified-communications.html
Answer is D.
Traversal zone (client and server) between E and C.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0/exwy_b_cisco-expressway-administrator-guide/exwy_m_zones-and-neighbors.html
That's to set up a connection from Exp-C to Exp-E. A Unified Communications Traversal Zone is required for MRA to work.
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