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.
start the database in the ARCHIVELOG mode
E.
start the database in the NOARCHIVELOG mode
A, B and D are correct. Please see prerequisites here:
https://docs.oracle.com/cd/B28359_01/backup.111/b28273/rcmsynta023.htm