以下MySQL语句中,已知关系模式stu_course(Sno,Cno,Term,Grade),在stu_course表中排序记录,正确的是( )。 A. SELECT * FROM stu_course ORDER BY grade ASC; B. SELECT cno,grade FROM stu_course grade DESC; C. SELECT * FROM stu_course ORDER BY cno ASC,grade DESC; D. SELECT * FROM stu_course cno ASC,grade DESC;