What type of software is designed to protect against Trojan Horses?

The type of software specifically designed to protect against Trojan Horses is anti-virus software. This kind of software is equipped to detect, quarantine, and remove malicious software, including Trojans, which are often used to create backdoors for unauthorized access to systems. Anti-virus programs work by scanning files for known signatures of malware and can also use heuristics to identify suspicious behavior that might indicate an unknown or new type of Trojan.

While anti-spyware software is designed to detect and eliminate spyware and similar threats, its primary focus does not typically extend to the broad spectrum of viruses and Trojans. Firewalls serve as a barrier between a trusted internal network and untrusted external networks, controlling traffic based on predetermined security rules but they do not actively scan or remove malware from files. Network monitoring software analyzes traffic patterns and network performance issues, but it is not specifically meant for malware detection.

Therefore, anti-virus software is the most appropriate choice because it directly targets and addresses the threat posed by Trojan Horses through a variety of scanning and protective mechanisms.