Final answer:
Content filtering is the most effective control for restricting access to unauthorized internet sites in an organization.
Step-by-step explanation:
The most effective control for restricting access to unauthorized internet sites in an organization is Content filtering. Content filtering refers to the use of software or hardware to block or limit access to certain websites based on predefined criteria such as categories, keywords, or URLs. It allows organizations to create policies and rules that determine what types of websites are permitted or blocked, ensuring a safe and secure internet browsing environment.
Firewalls, antivirus software, and password protection are important security measures, but they are not specifically designed to restrict access to unauthorized internet sites. Firewalls provide network security by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. Antivirus software protects against malware, viruses, and other malicious software. Password protection ensures that only authorized users can access specific resources or systems, but it does not control access to internet sites.