单选题:以下关于病毒的描述中,不正确的说法是(  )。

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题目内容:
以下关于病毒的描述中,不正确的说法是(  )。 A.对于病毒,最好的方法是采取“预防为主”的方针
B.杀毒软件可以抵御或清除所有病毒
C.恶意传播计算机病毒可能会是犯罪
D.计算机病毒都是人为制造的
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