Answer (D) is correct . Trojan horses and worms are threats to computerized systems. Data theft is a threat to any system. Serendipity is essentially a nonsense answer in that the word means the fortunate discovery of something good.
Answer (A) is incorrect because A Trojan horse is a destructive program that masquerades as a benign application.
Answer (B) is incorrect because A worm is a program or algorithm that replicates itself over a computer network and usually performs malicious actions, such as using up the computer’s resources and possibly shutting the system down.
Answer (C) is incorrect because Data theft is a threat to all systems.
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