Which of the Following Statements About the Comparable Worth Doctrine

Which of the following statements about the comparable worth doctrine is true?

A) Federal law requires employers to follow the doctrine.
B) It is the concept of equal pay for equal experience.
C) Some states have comparable worth laws for public sector employees.
D) The Supreme Court has made a decisive ruling on the doctrine.
E) The doctrine is based primarily on the idea of job seniority.