Which design restriction applies to Cisco Unified Communications Manager Session Management Edition clustering over the WAN deployment with extended round-trip times in Cisco Unified CM 9.1 and later releases?

Which design restriction applies to Cisco Unified Communications Manager Session Management Edition clustering over the WAN deployment with extended round-trip times in Cisco Unified CM 9.1 and later releases?
A . SIP and
B . 323 intercluster trunks are supported.
C . Only SIP trunk is supported.
D . SIP trunks and
E . 323 gateways are supported.
F . A minimum of 1.544 Mb/s bandwidth is required for all traffic between any two nodes in the cluster.
G . Only RSVP agents can be configured and registered to the SME cluster as media resources.

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Answer: B