单选:下列()操作不能有效防止网络攻击。A.使用防毒.防黑等防火墙软件B.设置代理服务器C.对连接的U盘进行严格的病毒扫描D.备份资料

题目内容:
下列()操作不能有效防止网络攻击。
A.使用防毒.防黑等防火墙软件
B.设置代理服务器
C.对连接的U盘进行严格的病毒扫描
D.备份资料
参考答案:

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