You deploy a Lync Server 2013 infrastructure that contains four servers. The servers are configured as shown in the following table.

You need to deploy a Persistent Chat pool. The solution must use the least amount of servers.
On which server should you install the Persistent Chat Server role?

A.
Lync1

B.
Lync2

C.
Lync3

D.
Lync4

E.
A new server