假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GRADE)。若要查找成绩不及格的学生姓名及不及格的课程号,正确的SQL语句是_______。

A. SELECT SNAME,C
B. FROM S,C WHERE (GRADE<60)AND (SC.C
C. =C.C
D. )
E. SELECT SNAME,C
FROM S,SC WHERE (GRADE<60)AND (S.S
G. =SC.S
H. )
I. SELECT SNAME,C
J. FROM S,SC WHERE (GRADE<60)AND (SC.C
K. =C.C
L. )
M. SELECT SNAME,C
N. FROM S,C WHERE (GRADE<60)AND (S.S
O. =SC.S
P. )