An administrator is tasked with performing a vMotion migration of a virtual machine. The virtual machine is configured as follows:
vSphere Flash Read Cache (vFRC) enabled
Is part of a Distributed Resource Cluster (DRS) Cluster
Which two statements are true? (Choose two.)

A.
Each ESXi host in the cluster supports multiple virtual flash resources.

B.
Each ESXi host in the cluster supports one virtual flash resource.

C.
DRS treats powered-on virtual machines with Flash Read Cache as having a preferred affinity to their current host and moves them only for mandatory reasons.

D.
DRS treats powered-on virtual machines with Flash Read Cache as having a required affinity to their current host and does not move them.

Explanation:
Each ESXi host in the culster supports one virtual flash resource. Secondly, DRS treats powered-on virtual machines with Flash Read Cache as having a preferred
affinity to the current host.
http://www.yellow-bricks.com/2013/09/11/frequently-asked-questions-vsphere-flash-read-cache/