检索选修四门以上课程的学生总成绩(不统计不及格的课程)，并要求按总成绩的降序排列出来。正确的SELECT语句是______。

A．SELECT S#, SUM(GRAD FROM SCWHERE GRADE＞=60GROUP BY S#ORDER BY 2 DESCHAVING COUNT(*)＞=4

B．SELECT S#, SUM(GRAD FROM SCWHERE GRADE＞=60GROUP BY S#HAVING COUNT(*)＞=4ORDER BY 2 DESC

C．SELECT S#, SUM(GRAD FROM SC WHERE GRADE＞=60 HAVING COUNT(*)＞=4 GROUP BY S# ORDER BY 2 DESC

D．SELECT S#, SUM(GRADFROM SC WHERE GRADE＞=60 ORDER BY 2 DESC GROUP BY S# HAVING COUNT(*)＞=4