Which One of the Following Teachers Is Violating the Family

Which one of the following teachers is violating the Family Educational Rights and Privacy Act of 1974?

A) A teacher has students put a star on a large wall chart every time they earn an A on a weekly quiz.
B) A teacher posts each student's test score by using a special code word that only he and the student know.
C) A teacher writes comments on the top of each test paper that tell a student what he or she has done well.
D) A teacher uses a teacher-made test that has been shown to have only moderate reliability.