What are the prerequisites for enabling Flashback Database？ （）

• A、 The database must be started in the MOUNT EXCLUSIVE state.
• B、 The database must have multiplexed control files.
• C、 The database must be opened by using a text-based parameter file instead of a server parameter file （SPFILE）.
• D、 The database must be in ARCHIVELOG mode.
• E、 The database must be in the NOMOUNT state.
• F、 The database must be opened in RESTRICTED mode.