Which type of software is designed to deny specific types of incoming traffic?

The correct choice is software that is specifically designed to deny specific types of incoming traffic, which aligns with the primary function of a firewall. A firewall acts as a barrier between a trusted internal network and untrusted external networks, such as the internet. It monitors and controls incoming and outgoing network traffic based on predetermined security rules. By filtering traffic, firewalls can block malicious access attempts and allow legitimate traffic to pass through, helping to protect the network from potential threats.

In contrast to firewalls, routers primarily serve to direct data packets between different networks but do not inherently provide the same level of security filtering. Antivirus software focuses on detecting and removing malware from devices rather than managing network traffic. An Intrusion Detection System (IDS) monitors network or system activities for malicious activities but does not actively block traffic; it typically functions in a passive observation manner and alerts administrators of potential threats, rather than denying access by itself.