What type of control can a network administrator implement to prevent employees from accessing unapproved streaming websites?

A technical control is the most appropriate choice for preventing employees from accessing unapproved streaming websites. Technical controls involve implementing hardware or software solutions to enforce policies and restrict access to certain resources. In this case, a network administrator might use firewalls, content filtering systems, or intrusion prevention systems to block access to specific websites.

These tools can actively monitor network traffic and deny requests to URLs deemed unapproved, ensuring that users are unable to access unauthorized content. This makes technical controls essential for managing web traffic and aligning network usage with organizational policies.

The other types of controls mentioned, such as detective, corrective, and operational, serve different purposes. Detective controls are used for monitoring and identifying inappropriate access after it occurs, rather than preventing it. Corrective controls are designed to fix issues after they happen, while operational controls focus on the day-to-day procedures and actions taken to maintain security rather than directly blocking access to specific online content.