CompTIA A+ 220-802

Answer: B - Rootkits are characterized as malware that enables privileged access to the operating system and therefore is able to conceal itself from normal detection methods.

Key Takeaway: Rootkits gain access to the root account on the computer (sort of like the administrator) and can therefore wreak havoc on a system-not to mention hide itself from detection. Trojans are viruses that pretend to be one thing (for instance a picture from your grandmother), but turn out to be a virus. Worms self-replicate and dig through a system as soon as the hardware is connected. Companies use spyware to gain information on how users use their computers.