Which three statements are true about Flashback Database?
选项：

A:Flashback logs are written sequentially, and are archived、
B:Flashback Database uses a restored control file to recover a database、
C: The Oracle database automatically creates, deletes, and resides flashback logs in the Fast RecoveryArea、
D: Flashback Database can recover a database to the state that it was in before a reset logs operation、
E: Flashback Database can recover a data file that was dropped during the span of time of the flashback、
F:Flashback logs are used to restore to the blocks' before images, and then the redo data may be used toRoll forward to the desired flashback time、