When Avaya Aura® Application Enablement Services (AES) accesses Communication Manager what can be said about Communication Manager?

When Avaya Aura® Application Enablement Services (AES) accesses Communication Manager what can be said about Communication Manager?
A . Communication Manager must be operating as Evolution Server
B . Communication Manager must be operating in a survivable remote mode
C . Communication Manager must be operating as Feature Server
D . Communication Manager must be operating in the Avaya Aura® Core

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Answer: A