Which of the following is not protected under FERPA?

The choice indicating that if a student is enrolled in a postsecondary institution but still under age 18, their parents must access educational documents is not protected under FERPA because once a student is enrolled in a postsecondary institution, they are considered an "eligible student" regardless of their age. This means that the rights under FERPA belong to the student, not the parents, even if the student is younger than 18. Therefore, parents do not automatically have the right to access educational records simply due to the student's age while in postsecondary education.

In contrast, the other statements highlight aspects of FERPA rights accurately: medical records are protected under FERPA, students gain rights to inspect and challenge the accuracy of their records at age 18, and upon turning 18, students have the same rights as their parents concerning access to educational records.