Which of the following recovery plan test results would be most useful to management? 下列哪个恢复计划测试的结果将对管理层最有用？（）

• A、amount of work completed. 完成的工作量
• B、description of each activity. 每个活动的描述
• C、list of successful and unsuccessful activities. 成功与不成功的活动清单
• D、elapsed time to perform various activities. 运行时间来执行各种活动