Which step is taken when configuring a Cisco Expressway solution?

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Which step is taken when configuring a Cisco Expressway solution?
A . Configure the Expressway-E by using a non-traversal server zone.
B . Enable static NAT on the Expressway-E only.
C . Disable H.323 mode on the Expressway-E.
D . Enable H.323 H.460.19 demultiplexing mode on the Expressway-C.

Answer: B