You have purchased additional storage for your storage array and want to load balance the space
and performance to utilize the new drives as simply as possible. Which feature can be used to
automatically move some of the VMs from the old disks to the new disks?

A.
Distributed Resource Scheduler (DRS)

B.
vSphere Replication (VR)

C.
Storage DRS

D.
Storage vMotion

Explanation:
http://www.vmware.com/files/pdf/techpaper/vsphere-storage-drs-interoperability.pdf