Question

a ______ is a program that takes complete control of your computer without your knowledge.
a. sniffer
b. botnet
c. rootkit
d. vpn

Explanation:

A rootkit is malware that gains unauthorized administrative (root) access to a computer, taking complete control without the user's knowledge. A sniffer monitors network traffic, a botnet is a network of infected devices, and a VPN is a secure network tool—none match the description except rootkit.

Answer:

C. rootkit