Which two items are configured when deploying a B2B collaboration solution? (Choose two.)

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Which two items are configured when deploying a B2B collaboration solution? (Choose two.)
A . SIP trunk between Cisco Unified Communications Manager and Cisco Expressway-C
B . search rules in Cisco Expressway-E
C . SIP trunk between Cisco Unified Communications Manager and Cisco Expressway-E
D . traversal client on a Cisco Expressway-E
E . DNS zone on a Cisco Expressway-C

Answer: AB