Antivirus servers can look for which types of malware?

• A. Viruses
• B. Worms
• C. Trojan horses
• D. All of the above

Answer: (D)

Antivirus servers are built to detect multiple forms of malicious software, not just one category. Viruses attach to legitimate files and spread by infecting them. Worms propagate themselves across networks without user action, often exploiting vulnerabilities. Trojan horses disguise themselves as harmless programs to trick users into running them, after which they perform hidden malicious actions. Modern antivirus engines use both signature-based detection for known threats and heuristic/behavioral analysis to spot suspicious activity, so they can identify viruses, worms, and Trojans. Because antivirus tools aim to recognize a wide range of malware types, all of the above is the correct choice. In practice, server-side protection scans email attachments, file shares, and traffic to catch these threats at the network and gateway levels before they reach endpoints.