为自己加油

Which two are true about reclaiming space used by Flashback logs in

Oracle Database 19c later releases? (Choose two.)

A.
Space is always reclaimed automatically when the retention period for
Flashback logs is lowered.
B.
Space might be reclaimed proactively before space pressure occurs.
C.
Space might be reclaimed automatically when the retention period for
Flashback logs is lowered.
D.
Space is only reclaimed when there is space pressure in the Fast Recovery Area.
(FRA)
E.Space is always reclaimed proactively before space pressure occurs.