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Identify two situations in which you can use Data Recovery Advisor for recovery. (Choose two.)
A.The database files are corrupted when the database is open.
B.The user has dropped an important table that needs to be recovered.
C.The archived redo log files are missing for which the backup is not available.
D.The database is not opening because the required database files are missing.

　　Data Recovery Advisor 是 oracle 11g 推出且归属于 rman 的一种新特性，它是 Oracle 11g Database 所推出的一种故障解决工具， 具有自动化得故障检测、故障定位、提出最优解决方案、按照用户的需求执行解决方案等功能。
　　Data Recovery Advisor 可处理以下两种情况：一种是因必需的数据库文件缺失、不一致或损坏而无法启动数据库，另一种是在运行时发现文件损坏。