An applicant for employment or an employee in the classified service may appeal the rejection of such applicant’s or employee’s application, in writing, to the Commissioner of Administrative Services not later than six business days after the transmittal of such rejection notice by providing supplementary information on qualifications as may be necessary. Such applicant or employee may request a review of such rejection by an independent human resource professional who shall render a final decision on the applicant’s or employee’s appeal within fifteen days thereafter.