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.