设有学生表S(学号,姓名,性别,年龄),查询所有年龄小于等于18岁的女同学、并按年龄进行降序排序生成新的表WS,正确的SQL命令是______。
A.SELECT * FROM S WHERE 性别='女' AND 年龄<=18 ORDER BY 4 DESC INTO TABLE WS
B.SELECT * FROM S WHERE 性别='女' AND 年龄<=18 ORDER BY 年龄 INTO TABLE WS
C.SELECT * FROM S WHERE 性别='女' AND 年龄<=18 ORDER BY '年龄' DESC INTO TABLE WS
D.SELECT * FROM S WHERE 性别='女' OR 年龄<=18 ORDER BY '年龄' ASC INTO TABLE WS