Which of the following is NOT a common type of malware?

The choice identified as the correct answer refers to "Router," which is not classified as a common type of malware. Malware encompasses various malicious software designed to disrupt, damage, or gain unauthorized access to computer systems. Common types of malware include spyware, ransomware, and trojans, each serving different malicious purposes.

Spyware secretly observes user activity and can collect sensitive information. Ransomware is designed to encrypt files on a victim's system, demanding payment for the decryption key. Trojans disguise themselves as legitimate software to trick users into installing them, often leading to unauthorized access or damage.

A router, on the other hand, is a hardware device that directs data traffic between devices on a network. It does not fit into the category of malware because it is not inherently malicious software; rather, it is a vital component of networking infrastructure.

Understanding these distinctions is essential for recognizing and identifying the threats posed by malware as well as the legitimate roles of network devices.