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