Which three VMware-recommended best practices should an administrator follow before upgrading to vSphere
6.5? (Choose three.)
Disconnect ESXi host from vCenter.
VMware Tools are installed in the virtual machine.
Ensure that the system hardware complies with ESXi requirements.
Back up the host.
Check the interoperability of any other software integrated with vSphere.
As is logical for any software update, first backup the host. The check to ensure system hardware compatibility
according to ESXi requirements. You also need to check interoperability of software integrated with vSphere.