Continuity of operations planning (COOP) sites provide an alternate location for operations after a critical outage. If you're planning on taking the Security+ exam, you should have a basic understanding of the most common sites and how to test their effectiveness.
For example, can you answer this question?
Q. Personnel within your organization turned off the HR data server for over six hours to perform a test. Which of the following is the MOST likely purpose of this?
B. Succession planning
C. Tabletop exercises
More, do you know why the correct answer is correct and the incorrect answers are incorrect? The answer and explanation is available here.