Which of the following BEST helps to ensure a third-party backup site continues to meet...

A Service Level Agreement (SLA) is a legally binding document that defines the performance and compliance expectations for third-party services, including information security requirements. It is the best mechanism to ensure that the third-party backup site meets ongoing security standards.

“SLAs should include security, availability, and performance expectations to align third-party services with organizational policies.”

— CISM Review Manual 15th Edition, Chapter 3: Program Development, Section: Third-Party Relationships*