What option should be set if you want to prevent an individual IP address from accessing the network?

To prevent an individual IP address from accessing the network, adding the IP to a deny list is the correct method. A deny list effectively blocks traffic from specified IP addresses, ensuring that any request from those addresses will be refused. This approach is fundamental in network security, allowing administrators to specify which addresses are not permitted to communicate with the rest of the network, thus reducing the risk of unauthorized access or attacks.

The other options focus on different functionalities. For instance, a permit list would allow traffic from specified IPs rather than blocking it. Adding the IP to the firewall could mean various things but does not inherently imply that the IP will be denied access unless specifically configured to do so. Lastly, adding the IP to a rate limit is used to control the amount of bandwidth or the number of requests an IP can make, but it does not prevent access outright; rather, it just limits the amount of communication allowed. Therefore, using a deny list is the most straightforward and effective way to block access for a particular IP address.