What is the green and economical configuration to meet this requirement?

Your customers have SIP phones and SIP trunks in their affiliates. This branch does not require TDM, and after analyzing the SIP phone usage, it is found that at some specific time, 2000 digital signal are required to process resources. They began to consider the rack space of the machine room.

What is the green and economical configuration to meet this requirement?
A . 7 G430 Gateways
B . 7 G450 Gateways
C . 1 Avaya Aura Media Server
D . 1 Avaya Aura Session Manager
E . 2 Avaya Aura Media Servers
F . 2 Avaya Aura Session Managers

Answer: C