(a) During the school year beginning on July 1, 1985, each county board of education shall develop a coordinated service delivery plan in accordance with standards for preschool programs for severely disabled children to be developed by the State Board of Education and begin services where plans are already developed.
(b) Only in any year in which funds are made available by legislative appropriation, and only to the extent of such funding, each county board of education shall establish and maintain a special educational program, including, but not limited to, special classes and home-teaching and visiting-teacher services for all severely disabled children between the ages of three and five according to the following schedule:
(1) By the school year beginning on July 1, 1986, and thereafter, for severely disabled children who are age four before September 1, 1986;