What should you include in the recommendation?

You are evaluating the use of standard gateway devices that support eight T1 interfaces each. The gateways do not support media bypass. You need to recommend a so lution to support PSTN calls from the main office. The solution must meet the companys technical requirements. What should you include in the recommendation?

A.
Deploy four gateways and a single Mediation pool that contains two servers.

B.
Deploy six gateways and a single Mediation pool that contains six servers.

C.
Deploy four gateways and two Mediation pools that each contains a single server.

D.
Deploy six gateways and a single Mediation pool that contains two servers.

Explanation:
Gateways can be calculated: 1000/8/23 = 5.43, so four won’t fulfill the simultaneous calls requirement.

There’s no need for six Mediation Servers though, because:
"New for the Mediation Server in Microsoft Lync Server 2010 is the ability for a single Mediation Server to route outbound calls through multiple gateways. In previous releases, there was a 1:1 ratio of Mediation Server to gateways." (http://technet.microsoft.com/en-us/library/gg425806.aspx)