Which component acts as the controller for all H.323 VoIP connections in an Avaya Aura Experience Po

Which component acts as the controller for all H.323 VoIP connections in an Avaya Aura Experience Portal (AAEP) system?

A. The proxy server on the Communication Manager

B. The gatekeeper on the Communication Manager

C. The gatekeeper on the Session Manager
D. The proxy server on the Session Manager

Reference: https://downloads.avaya.com/css/P8/documents/101045870