Which two options should be used to create a secure traversal zone between the Expressway-C and Expressway-E? (Choose two.)

Which two options should be used to create a secure traversal zone between the Expressway-C and Expressway-E? (Choose two.)
A . Expressway-C and Expressway-E must trust each other’s server certificate.
B . One Cisco Unified Communications traversal zone for
C . 323 and SIP connections.
D . A separate pair of traversal zones must be configured if an
E . 323 connection is required and Interworking is disabled.
F . Enable username and password authentication verification on Expressway-
H . Create a set of username and password on each of the Expressway-C and Expressway-E to authenticate the neighboring peer.

Answer: AC