What is a common feature of scareware?

Scareware is designed to deceive users into believing their systems are compromised or infected with malware. It typically does this by displaying alarming messages or pop-up warnings that suggest immediate action is necessary, such as purchasing a specific software solution to remove a nonexistent threat. By inducing fear, scareware exploits the user's anxiety and urgency to solidify its sales strategy. This method is effective in persuading users to make impulsive purchases, which is why option C accurately reflects the defining characteristic of scareware.

Other options don't accurately represent scareware. For instance, while some malicious software can be free to download, scareware is primarily characterized by its fraudulent and manipulative intent rather than its pricing model. Additionally, scareware does not provide genuine security; rather, it falsely claims to enhance security to drive purchases. Finally, it is typically created by unscrupulous developers or groups, rather than reputable companies, as its primary goal is deceit.