From a design point of view, which Avaya Aura Messaging (AAM) deployment architecture can better meet the needs of users to avoid failure?

A user is more concerned about the new voicemail power failure resolution mechanism, because they have encountered voicemail system is not available. This user network has two sets of PBX, the average distribution of users in two systems. Users are interested in the function of Avaya Aura Messaging (AAM).

From a design point of view, which Avaya Aura Messaging (AAM) deployment architecture can better meet the needs of users to avoid failure?
A . Each branch’s PBX connected to the same application server and the same centralized storage server
B . Each branch is a cluster of two application servers, and then connected to the same centralized storage server
C . The same site deploy a cluster of two application servers and a centralized storage server
D . Each branch of an application server connected to the storage server cluster

Answer: B