Sara, a user, downloads a keygen to install pirated software. After running the keygen, system
performance is extremely slow and numerous antivirus alerts are displayed. Which of the following
BEST describes this type of malware?

A.
Logic bomb

B.
Worm

C.
Trojan

D.
Adware

Explanation:
In computers, a Trojan is a program in which malicious or harmful code is contained inside
apparently harmless programming or data in such a way that it can get control and do its chosen
form of damage, such as ruining the file allocation table on your hard disk. In one celebrated case,
a Trojan was a program that was supposed to find and destroy computer viruses. A Trojan horse
may be widely redistributed as part of a computer virus.