Final answer:
A firewall fits into the category of preventive control.
Step-by-step explanation:
The firewall in Ben's organization's network would fall under the category of preventive control. A firewall is designed to prevent unauthorized access to a network by filtering incoming and outgoing network traffic according to a set of predefined rules. It acts as a barrier between the internal network and external networks, allowing only authorized traffic to pass through and blocking potentially harmful or suspicious traffic.