The primary consideration for determining recovery priorities in a disaster recovery situation is the impact of business disruption on the organization's mission, objectives, and stakeholders. Business disruption can result in loss of revenue, reputation, customer satisfaction, market share, and competitive advantage. Therefore, the recovery priorities should be based on the criticality of the business processes and functions that support the organization's value proposition and strategic goals. Data security (A), recovery costs (B), and recovery resource availability (D) are important factors, but they are secondary to the impact of business disruption.
Data security should be ensured throughout the recovery process, but it does not determine the recovery order.
Recovery costs should be balanced with the benefits of restoring the business operations, but they do not reflect the urgency of the recovery. Recovery resource availability should be assessed and allocated according to the recovery priorities, but it does not define the recovery sequence. (Risk and Information Systems Control Review Questions, Answers & Explanations Manual, 5th Edition, page 982)