Comprehensive and Detailed In-Depth Explanation:The primary purpose of a Business Impact Analysis (BIA) is to prioritize the restoration of systems and applications (D) based on their criticality to business operations. A BIA assesses the impact of disruptions, identifies critical processes, and determines recovery time objectives (RTOs) and recovery point objectives (RPOs). Other options: * Identifying legal obligations (A) is an aspect of compliance but not the primary benefit of a BIA. * Providing updates on disaster risk levels (B) falls under risk management rather than BIA objectives. * Delineating employee responsibilities (C) is part of business continuity planning (BCP), not the BIA's main goal. Reference: ISACA CISA Review Manual, Information Systems Operations and Business Resilience