; and (iii) are subject, for any violation of clause (i) or (ii), to enforcement action under this Act; and (C) supporting the recruitment, employment, and retention of nontraditional apprenticeship populations in programs under the national apprenticeship system in high-skill, high-wage, and in-demand industry sectors and occupations, including women, people of color, individuals with disabilities, individuals impacted by the criminal and juvenile justice system, and individuals with barriers to employment, as applicable. (8) The program awards a certificate of completion in recognition of successful completion of the program, evidenced by an appropriate certificate issued by the registration agency, and culminates in a recognized postsecondary credential (as defined in section 3 of the Workforce Innovation and Opportunity Act). (9) The program provides that an individual who is to become a program participant under the program enters into a written apprenticeship agreement with the sponsor of the program. (10) The ratio of program participants to supervisors (such as journeyworkers, mentors, or on-the-job learning instructors, as applicable) for the apprenticeable occupation, that are based on evidence-based and evidence-informed best practices for supervision, training, safety, and continuity of employment, throughout the work processes of the program, job site, department, or plant, appropriate for the degree of hazard in different occupations, and provisions in collective bargaining agreements, as applicable, except if such ratios are expressly prohibited by the collective bargaining agreements. (c) Apprenticeship agreements (1) In general To ensure the standards described in subsection (b) are applied to programs under the national apprenticeship system, the Administrator shall require a sponsor to develop an apprenticeship agreement that shall— (A) be the same for each program participant; (B) contain the names and signatures of the program participant and the sponsor