查询没有借阅图书的读者的姓名和借书证号,应使用SQL语句
A.SELECT姓名FROM读者WHERE NOT EXISTS; (SELECT借书证号FROM借阅WHERE借阅.借书证号=读者.借书证号)
B.SELECT姓名,借书证号FROM读者WHERE (SELECT,FROM借阅WHERE借阅.借书证号=读者.借书证号)
C.SELECT姓名,借书证号FROM读者WHERE NOT EXISTS; (SELECT * FROM借阅WHERE借阅,借书证号=读者.借书证号)
D.SELECT姓名,借书证号FROM读者WHERE借阅=NULL (SELECT * FROM借阅WHERE借阅.借书证号=读者.借书证号)