Persons from low-income groups include the following:
(a) Persons receiving medical assistance under Chapter 7 (commencing with Section 14000) of this part.
(b) Persons qualified to receive free health care or health care that is substantially free provided by the Office of Economic Opportunity’s Neighborhood Health Center Program or state, county, or local public health services.
(c) Persons eligible for treatment, correction of defects, or aftercare in the children and youth projects of the Department of Health, Education, and Welfare.
(d) Indians receiving free medical and health care from the Division of Indian Health, United States Public Health Service.