You have a Lync Server 2013 infrastructure.
You plan to deploy Persistent Chat features to meet the following requirements:
Support up to 50,000 concurrent users.
Enable the Persistent Chat Server Compliance service.
Ensure that all of the features are automatically available if a single server fails.
You need to identify the minimum number of Front End Servers and Microsoft SQL Server Back End Servers that are required for the planned deployment.
How many servers should you identify?
(To answer, select the appropriate number of servers for each component in the answer area.)
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