What function does Enhanced vMotion Compatibility (EVC) provide?

What function does Enhanced vMotion Compatibility (EVC) provide?

A.
The ability to enable Fault Tolerance on virtual machines that are not members of a cluster.

B.
The ability to use vMotion to migrate virtual machines between ESXi hosts with different CPU
vendors.

C.
The ability to replace manual CPU identification masks with an automated process managed by
the cluster.

D.
The ability to use vMotion to migrate virtual machines between hosts with identical CPUs but
different vSphere versions.

Explanation:
http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.vcenterhost.doc%2FGUID-9F444D9B-44A0-4967-8C07-693C6B40278A.html