What are three reasons for deploying vCenter Server in a virtual machine?

What are three reasons for deploying vCenter Server in a virtual machine? (Choose three.)

A.
vCenter Server must be deployed as virtual machines to join a Linked Mode group.

B.
vCenter Server must be deployed as a virtual machine to be migrated using vMotion.

C.
vCenter Server must be deployed as a virtual machine to back it up using VMware Data Recovery.

D.
vCenter Server must be deployed as a virtual machine to be protected by HA.

E.
vCenter Server must be deployed as a virtual machine to support failover using VMware vCenter Site Recovery Manager.