Which of the following refers to the term used to restore a system to its operational state?

MTBF (Mean Time Between Failures) measures the average time a system operates without failure, indicating reliability rather than restoration time.

MTTR (Mean Time To Recover/Repair/Restore) is the average time it takes to repair a failed system or component and return it to its fully operational state. This metric is a key indicator of maintainability and the speed at which an IT service can return to service after an incident, directly aligning with the process of restoring a system to an operational state.

RTO (Recovery Time Objective) is a target objective for the maximum permissible downtime, not the actual average time taken for restoration.

RPO (Recovery Point Objective) is a target objective for the maximum acceptable data loss, focusing on data currency rather than restoration time.