Which properties should you modify from the Lync Server 2010 Topology Builder?

You need to enable Call Admission Control for a Lync Server 2010 deployment,
Which properties should you modify from the Lync Server 2010 Topology Builder?

A.
Front End Server.

B.
Mediation pools.

C.
PSTN gateways.

D.
Site.

Explanation:
http://technet.microsoft.com/en-us/library/gg520942.aspx