对于教学数据库的3个基本表：S（Sno，Sname，Ssex）、SC（Sno，Cno，Grade）、C（Cno，Cname，Teache），其中S表为学生表，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<br> FROM S，SC，C<br> WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher='LIU' AND Ssex='F'
B．SELECT Sname<br> FROM S WHERE Ssex='F' AND Sno IN<br> (SELECT Sno<br> FROM SC<br> WHERE Cno IN (SELECT Cno FROM C<br> WHERE Teacher='LIU'))
C．SELECT Sname<br> FROM S WHERE Ssex='F' AND EXISTS(SELECT *<br> FROM SC<br> WHERE SC.Sno=S.Sno AND EXISTS<br> (SELECT *<br> FROMC<br> WHERE Teacher='LIU'))
D．SELECT Sname<br> FROM S WHERE Ssex='F' AND EXISTS (SELECT *<br> FROM SC<br> WHERE SC.Sno=S.Sno AND EXISTS<br> (SELECT *<br> FROM C<br> WHERE C.Cno=SC.Cno AND Teacher='LIU'))