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【单选题】
以下关于DoS攻击的描述，哪句话是正确的？A.
导致目标系统无法处理正常用户的请求
B.
以窃取目标系统上的机密信息为目的
C.
不需要侵入受攻击的系统
D.
如果目标系统没有漏洞，远程攻击就不可能成功
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