Final answer:
An entity's disaster recovery plan most likely includes storing duplicate copies of files in an offsite location, to ensure data can be recovered in the event of a disaster.
Step-by-step explanation:
The question asks which procedure an entity would most likely include in its disaster recovery plan. The correct answer is D) Store duplicate copies of files in a location away from the computer center. This strategy is known as offsite backup storage and is essential for ensuring that the business can recover important data in the event of a disaster, such as a fire, flood, or cyber-attack that compromises the primary location.
Option A is not directly related to disaster recovery but data management. Option B is more aligned with security and prevention, whereas option C, developing an auxiliary power supply, though it could be a part of a disaster prevention or business continuity plan, is not primarily focused on data recovery.