Which of the following can be performed as a quick method to roll back to an earlier state, if necessary?

An administrator is performing an in-place upgrade on a quest VM operating system.

Which of the following can be performed as a quick method to roll back to an earlier state, if necessary?
A . A configuration file backup
B . A full backup of the database
C . A differential backup
D . A VM-level snapshot

Answer: D

Explanation:

Reference: https://cloud.google.com/compute/docs/tutorials/performing-in-place-upgrade-windows-server