Database course

8. Consider an Employee table with the following attributes Employee(EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, DEPTNO) Find the query that is equivalent to the following query: SELECT el.empno, el.sal FROM emp el WHERE el.sal> ALL (SELECT e2.sal FROM emp e2 WHERE e2.deptno = 20); O a) SELECT el.empno, el.sal FROM emp el WHERE el.sal IN (SELECT e2.sal FROM emp e2 WHERE e2.deptno = 20); O b) SELECT el.empno, el.sal FROM emp el WHERE EXISTS (SELECT e2.sal FROM emp e2 WHERE e2.deptno = 20 AND el.sal