对于教学数据库的三个基本表：S(Sno，Sname，Ssex)，SC(Sno，Cno，Grade)，C(Cno，Cname， Teacher)，其中S为学生表，SC为学生选课表，C为课程表，则对于语句：检索至少选修LIU老师所授课课程中一门课程的女生姓名，SQL语句错误的是______。
A) SELECT Sname
FROM S，SC，C
WHERE = AND = AND Teacher=‘LIU’AND Ssex=‘F’
B) SELECT Sname
FROM S WHERE Ssex=‘F’AND Sno IN
(SELECT Sno
FROM SC
WHERE Cno IN(SELECT Cno FROM C
WHERE Teacher=‘LIU’))
C) SELECT Sname
FROM S WHERE Ssex=‘F’AND EXISTS (SELECT*
FROM SC
WHERE = AND EXISTS
(SELECT*
FROM C
WHERE Teacher=‘LIU’))
D) SELECT Sname
FROM S WHERE Ssex=‘F’AND EXISTS(SELECT*
FROM SC
WHERE = AND EXISTS
(SELECT*
FROM C
WHERE = AND Teacher=‘LIU’))