What Act requires all pornographic sites to have some form of age verification?

The correct answer is the Children's Internet Protection Act of 2000 (CIPA). This Act specifically aims to protect children from exposure to harmful content on the internet. It requires schools and libraries that receive federal funding for internet access to implement measures to filter or block access to inappropriate content, including pornographic sites.

CIPA is critically focused on ensuring that minors do not have easy access to such content, thus necessitating some form of age verification to restrict access to adult materials. It is designed to maintain a safe online environment for children, which aligns perfectly with the requirements for age verification on pornographic websites.

The other options do not pertain to age verification for internet content. The Family Educational Rights and Privacy Act (FERPA) relates to the privacy of student education records, the Health Insurance Portability and Accountability Act (HIPAA) addresses the privacy and security of health information, and the Communications Decency Act provides broad protection for online service providers but does not specifically mandate age verification for pornographic sites like CIPA does.