When auditing a disaster recovery plan for a critical business area, an IS auditor finds that it does not cover all the systems. Which of the following is the MOST appropriate action for the IS auditor? 
A、Alert management and evaluate the impact of not covering all systems. 
B、Cancel the audit. 
C、Complete the audit of the systems covered by the existing disaster recovery plan. 
D、Postpone the audit until the systems are added to the disaster recovery plan.