QUESTION $7$

What is a Trojan Horse?

A$.$ Self$-$replicating computer program that penetrates an operating system $($OS$)$ intending to spread malicious code.

B$.$ Program that infects the Basic Input$/$Output System and can use DOS commands to spread themselves.

C$.$ Software that secretly gathers information about the user without the user's consent or knowledge.

D$.$ Malware that is disguised as legitimate software to trick users into installing it onto their systems.