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You can use Oracle Flashback to look at past activity in your database. What are two other characteristics of Oracle Flashback？（）
A:Oracle Flashback uses undo information to construct consistent data. 
B:You can use a cursor opened while using an Oracle Flashback image to perform DML once you deactivate Oracle Flashback in your session. 
C:You can only use Oracle Flashback view of the data if the required records are still in the online redo log files. 
D:Oracle Flashback lists the DML that was executed during the period you identify when initiating your session. 

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出自：Oracle认证

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