Which of the following BEST describes Recovery Time Objective (RTO)?

The best description of Recovery Time Objective (RTO) is the time of application resumption after disaster. RTO is a metric that defines the maximum acceptable time that an application or a system can be unavailable or offline after a disaster or a disruption. RTO is based on the business impact analysis and the recovery requirements of the organization, and it helps to determine the recovery strategies and the resources needed to restore the application or the system to its normal operation. Time of data validation after disaster, time of data restoration from backup after disaster, and time of application verification after disaster are not the best descriptions of RTO, as they are related to the quality, accuracy, or completeness of the data or the application, not the availability or the downtime of the application or the system. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 7, Security Operations, page 899. Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 7, Security Operations, page 915.