Which best describes Anti-Virus software?

• A. Program that encrypts files
• B. Program that logs all keystrokes
• C. Program capable of detecting, removing, and protecting against malware
• D. Program that blocks all email

Answer: (C)

Anti-Virus software is designed to guard a computer by detecting, removing, and preventing malware from running on the system. It uses virus definitions and heuristic analysis to recognize known and unknown threats, provides real-time protection to block malware as it tries to execute, scans files and emails for malicious content, quarantines or deletes identified threats, and keeps its database up to date. This broad capability—to detect threats, remove them, and protect the system from future infections—is what makes it the correct description. The other options describe functions that are not what antivirus software does: encryption protects data by making it unreadable, keylogging is a spying activity that antivirus aims to detect and stop, and blocking all email is not a practical or accurate core function of antivirus (though some security tools may filter unsafe content, they don’t block all email by design).