Which three Exchange servers should you associate to the UM dial plans?

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.)

A.
Server1

B.
Server2

C.
Server3

D.
Server4

E.
Server5

Explanation:
A) You can enable Unified Messaging (UM) in Microsoft Exchange Server 2010. You must enable the
Exchange computer running the Unified Messaging server role before the Unified Messaging server
can process calls for UM-enabled Exchange 2010 recipients in your Exchange organization. However,
the Unified Messaging server also must be added to a UM dial plan before it can process calls for
Unified Messaging.
BE)
Requirements and Recommendations Client Access and Mailbox. In Microsoft Exchange Server 2013,
Exchange UM runs as a service on these servers.
Deploy the Exchange Mailbox server roles in each Exchange Unified Messaging (UM) forest where
you want to enable users for Exchange UM.
Reference: Configuring Unified Messaging on Microsoft Exchange Server to Work with Lync Server
2013