Which of the following disaster recovery/continuity plan components provides the GREATEST assurance of recovery after a disaster? 
A、The alternate facility will be available until the original information processing facility is restored. 
B、User management is involved in the identification of critical systems and their associated critical recovery times. 
C、Copies of the plan are kept at the homes of key decision-making personnel. 
D、Feedback is provided to management assuring them that the business continuity plans are indeed workable and that the procedures are current.