You need to recommend changes to the Lync infrastructure to ensure that internal users can sign in to Lync 2010 if a Lync Server 2010 Front End Server fails. Which two actions should include in the recommendation? (Each correct answer presents part of the solution. Choose two.)
A.
For each Front End Server, configure a Service Location (SRV) record that uses an Alias (CNAME) record.
B.
Deploy a Director pool.
C.
For each Front End Server, configure a Service Location (SRV) record that uses a Host (A) record.
D.
Associate a backup registrar with each Front End Server.