22．With ______ growth of the Internet, computer security has become ______ major concern for businesses and governments．                   

A．the; a

B．the; the

C．不填; the

D．the; 不填

短信办理转账汇款业务的安全保障有哪些？（）

A.封闭转账、手机绑定

B.交易限额控制、验证码确认

C.可以与其他加密工具捆绑使用

D.具备防黑客网络