You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）
- A The time when the last flashback operation in your database was performed.
- B The time when the first flashback operation in your database was performed.
- C A list of flashback operations performed in your database using SCN and time.
- D The approximate time and the lowest system change number （SCN） to which you can flash back your database.