Which three VMware-recommended best practices should an administrator follow before upgrading to vSphere
6.5? (Choose three.)

A.
Disconnect ESXi host from vCenter.

B.
VMware Tools are installed in the virtual machine.

C.
Ensure that the system hardware complies with ESXi requirements.

D.
Back up the host.

E.
Check the interoperability of any other software integrated with vSphere.