The commissioner shall adopt rules under RSA 541-A relative to:
I. Eligibility for congregate services, based on financial, psychological, and physical ability. For this purpose, the department shall use, as appropriate, the federal guidelines for congregate housing services programs.
II. Costs to residents for services. These fees shall be reasonable, may not exceed the cost of providing the service, and shall be calculated on a sliding scale related to income, which permits the provision of services to such residents who cannot afford meal and service fees.
III. Eligibility for national affordable housing act funding and services. Such eligibility shall be based on federal and state guidelines.