How does an Avaya Aura® Branch Session Manager and Its Survivable Communication Manager communicate?

How does an Avaya Aura® Branch Session Manager and Its Survivable Communication Manager communicate?
A . By using the synchronization process
B . By using the Replication process
C . By using the SIP Entity & Entity Link manually created between the Branch Session Manager and the Survivable Communication Manager
D . By using a link that is automatically created after you built the Entity link between your Branch Session Manager and Main Communication Manager

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Answer: D