You have an Exchange Server organization that contains five servers. The servers are configured as shown in the following table.

You deploy Microsoft Lync Server 2010. You need to create a Lync Server SIP Unified
Messaging (UM) dial plan to enable voice integration between Lync Server and Exchange
Server.
Which three Exchange servers should you associate to the UM dial plans? (Each correct answer presents part of the solution. Choose three.)
Correct Answer: B,D,E
Add all Client Access and Mailbox servers to the SIP URI dial plan. However, if you have multiple SIP URI dial plans, you must add all Client Access and Mailbox servers to all SIP
URl dial plans.
Reference: Deploying Exchange 2013 UM and Lync Server overview
https://technet.microsoft.com/en-us/library/bb676409(v=exchg.150).aspx