Which type of virus requires user action to reproduce and spread?

The correct answer is that a virus, in general, requires user action to reproduce and spread. A virus refers to a type of malicious code that attaches itself to legitimate programs or files. Unlike worms or other forms of malware that can spread autonomously, viruses need some form of user interaction to execute. This may include opening an infected file, running a program that has been compromised, or clicking on a malicious link.

When activated by the user, the virus replicates and can then infect other files or programs on the system or even spread to other systems. The emphasis on user action is a key characteristic that differentiates viruses from others, such as worms, which can propagate without any required user interaction. Understanding this distinction is crucial for recognizing how various types of malware operate and how to defend against them effectively.