有关系模式SC(S#，C#，GRADE)，各属性分别表示学号、课程号、成绩，则“查询选修了3门以上课程的学生的学生号”，正确的SQL语句是( )。

A.SELECT S# FROM SC GROUP BY S# WHERE COUN(*)＞3

B.SELECT S# FROM SC GROUP BY S# HAVING COUN(*)＞3

C.SELECT S# FROM SC ORDER S# HAVING COUN(*)＞3

D.SELECT S# FROM SC ORDER S# WHERE COUN(*)＞3