Your network contains two servers named Server1 and Server2 that run Windows Server 2008 R2.
Server1 and Server2 are nodes in a failover cluster named Cluster1. The network contains two servers
named Server3 and Server4 that run Windows Server 2012 R2. Server3 and Server4 are nodes in a
failover cluster named Cluster2.
You need to move all of the applications and the services from Cluster1 to Cluster2.
What should you do first from Failover Cluster Manager?

A.
On a server in Cluster2, click Migrate Roles.

B.
On a server in Cluster2, click Move Core Cluster Resources, and then click Select Node…

C.
On a server in Cluster1, configure Cluster-Aware Updating.

D.
On a server in Cluster2, click Move Core Cluster Resources, and then click Best Possible Node.

Explanation:
http://blogs.msdn.com/b/clustering/archive/2012/06/25/10323434.aspx