8. 某企業(Emp)有數十個部門(Dept_name)，每個部門有數百人，吳總經理欲知道：「除了部門主管(Is_dept_ma nager)之外，平均薪資(Salary)在 50,000 元(含)以上的部門有那些？」，最能符合上述要求之 SQL 語法為何？
(A)SELECT Dept_name, AVG(Salary) FROM Emp WHERE Is_dept_manager=TRUE AND SUM (Salary)>=50000 GR OUP BY Dept_name
(B)SELECT Dept_name, AVG(Salary) FROM Emp WHERE Is_dept_manager=TRUE GROUP BY Dept_name HAVING AVG(Salary)>=50000
(C)SELECT Dept_name, AVG(Salary) FROM Emp WHERE Is_dept_mana ger=FALSE GROUP BY Dept_name HAVING AVG(Salary)>=50000
(D)SELECT Dept_name, AVG(Salary) FROM EM P WHERE Is_dept_manager=FALSE AND AVG(Salary)>=50000。