User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA， which commands must you execute to enable SCOTT to flash back the transactions？（）

A.ALTER DATABASE FLASHBACK ON

B.GRANT SELECT any transaction TO scott

C.GRANT EXECUTE ON dbms_flashback TO scott

D.ALTER DATABASE ADD SUPPLEMENTAL LOG DATA

E.ALTER TABLESPACE undots1 RETENTION GUARANTEE

F.ALTER DATABASE ADD SUPPLEMENTAL LOG DATA （PRIMARY KEY） COLUMNS