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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 Versions Query only
D:Flashback Database and Flashback Transaction Query
E:Flashback Versions Query and Flashback Transaction Query

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出自：Oracle认证

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