Answer (C) is correct . A Trojan horse is a computer program that appears friendly, for example, a game, but that actually contains an application destructive to the computer system.
Answer (A) is incorrect because A hoax virus is a false notice about the existence of a computer virus. It is usually disseminated through use of distribution lists and is sent by email or via an internal network.
Answer (B) is incorrect because A web crawler (a spider or bot) is a computer program created to access and read information on websites. The results are included as entries in the index of a search engine.
Answer (D) is incorrect because A killer application is one that is so useful that it may justify widespread adoption of a new technology.
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