Recovery time objective RTO is correct because it specifies how quickly an application or service must be restored after a disruption to meet business continuity and disaster recovery objectives.

Recovery time objective RTO defines the maximum acceptable downtime and is expressed as a time target. It drives the choice of recovery strategies and the resources that must be in place to meet the business requirement for restoration speed.

Recovery time objective RTO is different from Recovery point objective RPO. The RPO metric measures acceptable data loss in time since the last good backup and does not describe restoration speed.

Recovery point objective RPO is incorrect because it addresses allowable data loss rather than the time required to bring systems back online. It helps determine backup frequency and recovery points but not how fast recovery must occur.

Mean time to repair MTTR is incorrect because it describes the average time to repair a failed component in maintenance and reliability contexts. It is not the business continuity target for how quickly an application must be restored after a disaster.

Service level agreement SLA is incorrect because it is a contract that defines overall service expectations and obligations. An SLA may include a Recovery time objective RTO as a metric but the SLA itself is not the specific recovery time target asked for in the question.

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