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By mistake， you ran the batch job （for updating the BILL_DETAILS table） twice. You are not sure which rows in the BILL_DETAILS table were affected. You need to identify：  a） A list of changes made along with the transaction identifier of each change.  b） The necessary SQL statements to undo the erroneous changes.  Which option would you choose？（）
A: RMAN only.
B: Flashback Table only.
C: Flashback Version Query only.
D: Flashback Database and Flashback Transaction Query.
E: Flashback Version Query and Flashback Transaction Query.

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出自：Oracle认证

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