These are the details&

These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC v$FLASHBACK_DATABASE_STAT  Name                    Null？              Type  ------------- -------- --------------  BEGIN_TIME                               DATE  END_TIME                                 DATE  FLASHBACK_DATA                        NUMBER  DB_DATA                                  NUMBER  REDO_DATA                               NUMBER  ESTIMATED_FLASHBACK_SIZE             NUMBER  Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （）

• A BEGIN_TIME is the time at which Flashback logging is enabled.
• B END_TIME is the time at which the query is executed on the view.
• C REDO_DATA is the number of bytes of redo data written during the interval.
• D This view contains information about flashback data pertaining to the last 24 hours.
• E FLASHBACK_DATA is the amount of flashback data generated since the database was opened.