; (D) not more than 7 days after the date of receipt of a complaint under subparagraph (C), review the complaint and request a response from the institution; (E) undertake an investigation, in response to a complaint under subparagraph (C) or at the Secretary’s independent initiative, to determine whether a private institution of higher education has failed to disclose a policy pertaining to the protection and regulation of the expressive rights of students as required by this section, is enforcing a policy pertaining to the expressive rights of students that has not been disclosed as required by this section, or has failed to make and publish a statement affirming contractual responsibility for full policy disclosure, or affirming contractual responsibility for the enforcement of speech policies, as required by this section