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

Disconnecting ESXi hosts from vCenter before upgrading is not a recommended best practice; vCenter should remain connected to manage and monitor the upgrade process across all hosts.

Having VMware Tools installed in virtual machines is a general operational best practice but is not a prerequisite step required before performing the vSphere infrastructure upgrade itself.

Verifying that system hardware meets ESXi 6.5 requirements using the VMware Compatibility Guide is mandatory to ensure the upgrade will succeed and the host will remain supported after upgrade.

Backing up the host configuration and critical data protects against data loss or corruption if the upgrade fails or a rollback is required.

Checking interoperability of integrated third-party software such as backup agents, management tools, and security software prevents post-upgrade failures caused by incompatible component versions.