Which steps should an administrator take to migrate existing ESXi 5.x virtual machines to a storage over-subscription model?

Which steps should an administrator take to migrate existing ESXi 5.x virtual machines to a storage
over-subscription model?

A.
Right-click the .vmdk file, and click Deflate.

B.
Right-click the .vmdk file, and click Compress.

C.
Right-click the virtual machine, click Migrate, select the same datastore, and select Thin Provision.

D.
Right-click the virtual machine, click Migrate, select a different datastore, and select Thin
Provision.