Which type of security threat can be described as software that attaches itself to another program to execute a specific unwanted function?

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Which type of security threat can be described as software that attaches itself to another program to execute a specific unwanted function?

Worm
Virus
Proxy Trojan horse
Denial-of-service Trojan horse

Explanation: Viruses can be malicious and destructive or simply change something about the computer, such as words or images, and not necessarily cause thecomputer to malfunction. Viruses can be spread through shared media such as CDs or memory sticks, but can also be delivered via the Internet and email.

Which type of security threat can be described as software that attaches itself to another program to execute a specific unwanted function?

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