Which three actions are required to configure the Flashback Database?

Which three actions are required to configure the Flashback Database? (Choose three.)

A.
set Flash Recovery Area

B.
enable Flashback logging

C.
create FLASHBACK tablespace

D.
create a user called flashoper

E.
start the database in the ARCHIVELOG mode

F.
start the database in the NOARCHIVELOG mode

Explanation:
The requirements for enabling Flashback Database are:
* Your database must be running in ARCHIVELOG mode, because archived logs are used in the Flashback Database operation.
* You must have a flash recovery area enabled, because flashback logs can only be stored in the flash recovery area.
* Enable flashback loging . To enable logging for Flashback Database, set the DB_FLASHBACK_RETENTION_
TARGET initialization parameter and issue the ALTER DATABASE FLASHBACK ON statement.
REF.: Oracle(r) 10g Backup and Recovery Basics, 5-2 and 5-