Which two are prerequisites for performing a flashback transaction?

Which two are prerequisites for performing a flashback transaction?

A.
Undo retention guarantee for the database must be configured.

B.
Recycle bin must be enabled for the database.

C.
Block change tracking must be enabled tor the database.

D.
Flashback Database must be enabled.

E.
Supplemental logging must be enabled.

F.
EXECUTE privilege on the DBMS_FLASHBACK package must be granted to the user
flashing back transaction.