User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA, which commands must you exec

[answerhappygod]

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;