Correct Answer. B. The firewall rules to ensure traffic to the web server's IP and port is allowed Firewalls control the flow of traffic based on security rules, and improperly configured rules can block access to certain services or servers within a network.
Option A is incorrect. While ensuring the firewall is powered and functioning is important, it does not directly address connectivity issues to a specific service.
Option C is incorrect. While antivirus settings are important for overall security, they are not directly related to allowing or blocking access to specific network services.
Option D is incorrect. Bandwidth management could affect performance but would not specifically block access to a network service unless configured to do so.