At least what kind of configuration do they need to meet their needs?

Your customers are interested in saving money using internal voice conferencing systems, and they expect 1,500 meeting users. They have a main point, and four scattered branches. They are also interested in high reliability and bandwidth optimization.

At least what kind of configuration do they need to meet their needs?
A . The main point has two Avaya Aura Conferencing Single Server redundancy configuration. Each branch has one Application Delivery Controller and proprietary AMS Media servers.
B . The main point has one Avaya Aura Conferencing Single Server and one Application Delivery Controller. Each branch has the proprietary AMS Media servers.
C . The main point has one Avaya Aura Conferencing Single Server. Each branch has one Application Delivery Controller and proprietary AMS Media servers.

Answer: B