[A39] You have a Microsoft Exchange Server 2010 Service Pack 2 (SP2) organization and a Lync Server 2013 infrastructure. You need to design a Unified Messaging (UM) solution to meet the following requirements:
. Support a peak concurrency of 500 calls.
. Connect to two Lync Server 2013 pools.
What is the minimum number of UM servers required?
A. 1
B. 2
C. 3
D. 5
