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.