[单选]  删除计算机系学生（在student表中）的修课记录（在SC表中）的语句，正确的是（ ）。

a. DELETE  FROM SC JOIN Student b ON S.Sno = b.Sno      WHERE Sdept = '计算机系' b. DELETE FROM SC FROM SC JOIN Student b ON SC.Sno = b.Sno      WHERE Sdept = '计算机系' c. DELETE FROM Student  WHERE Sdept = '计算机系' d. DELETE FROM SC WHERE Sdept = '计算机系'