基于这样的三个表即学生表ST、课程表CO和学生选课表SC,它们的结构如下:ST()。其中:.S_ID为学号,SN为姓名,SEX为性别,AGE为年龄,DEPT为系别,C_ID为课程号,CN为课程名,GRADE为成绩。检索学生姓名及其所选修课程的课程号和成绩。正确的SELECT语句是____.
A.SELECT ST.SN,S
C.C_ID,S
C.GRADE FROM ST WHERE ST.S_ID=S
C.S_ID
B.SELECT ST.SN,S
C.C_ID,S
C.GRADE FROM SC WHERE ST.S_ID=S
C.GRADE
C.SELECT ST.SN,S
C.C_ID,S
C.GRADE FROM ST,SC WHERE ST.S_ID=S
C.S_I
D.SELECT ST.SN,S
C.C_ID,S
C.GRADE FROM ST,SC