Which three statements are true about Flashback Database?（）
- 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 to roll forward to the desired flashback time.