You are working on the APPDB database as a DBA. The database has a default Flashback Data Archive DFLA1 created on it. You issued the following command to drop the Flashback Archive FLA1: DROP FLASHBACK ARCHIVE fla1,What is the effect of this command?（）

• A、The Flashback Archive FLA1 is dropped only if it is empty.
• B、The tablespace having Flashback Archive is dropped.
• C、The Flashback Archive FLA1 is dropped after moving the existing data in it to the default Flashback Archive.
• D、The Flashback Data Archive and historical data are dropped.