; (B) the Office of Personnel Management; and (C) the Comptroller General of the United States. (d) Independent study of personnel requirements determination model (1) Requirement for study Not later than 90 days after the completion of the personnel requirements determination model pursuant to subsection (c)(1), the Secretary of Homeland Security shall enter into a contract with a qualified research entity to conduct a study that analyzes the validity of the model. (2) Reports (A) To secretary Not later than 1 year after the completion of the personnel requirements determination model under subsection (c)(1), the qualified research entity shall submit a report to the Secretary of Homeland Security that includes— (i) the results of the study required under paragraph (1)