When servers need operating system upgrades or patches, administrators take them offline intentionally so they can perform the necessary work without risking malicious attacks?

The answer is True

Unintentional downtime which is as a result of malicious attacks is less common. Research however indicates that it is growing rapidly. Downtime can be unintentional or intentional. Many times, admins schedule intentional downtime in advance. They try to this so that it has a small impact on the rest of the organization.