Which two statements complete a transaction?

Which two statements complete a transaction? (Choose two)

A.
GRANT SELECT ON employees TO SCOTT;

B.
ALTER TABLE employeesSET UNUSED COLUMN sal;

C.
ROLLBACK TO SAVEPOINT C;

D.
DESCRIBE employees;

E.
DELETE employees;

F.
Select MAX(sal)FROM employeesWHERE department_id = 20;