What does RTO define?

• A. The maximum downtime allowed for a system resource
• B. The maximum amount of time a system resource can remain unavailable before an unacceptable impact on other resources, supported mission/business, and the MTD
• C. The time needed to verify system integrity after a disruption
• D. The time to switch to a backup system

Answer: (B)

RTO defines the maximum amount of time a system resource can remain unavailable before there is an unacceptable impact on other resources, the supported mission or business, and the Maximum Tolerable Downtime. This reflects how long the organization can endure a disruption without suffering significant harm, and it guides how quickly you must recover and which recovery strategies to prioritize. It also distinguishes downtime tolerance from related concepts like data loss tolerance (RPO) and the actual steps to switch to a backup (which is about executing recovery, not the tolerance itself).