A.
SELECT S#,SUM(GRADE)FROM SC WHERE GRADE>=60 GROUP BY S# HAVING COUNT(C #)>=4 ORDER BY 2 DESC
B.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE IN (SELECT GRADE FROM SC W
C.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE NOT IN (SELECT GRADE FROM SC
D.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE>=ALL (SELECT GRADE FROM SC )