(1) Each school district within the service area of the education service cooperative shall be entitled to participate in those programs and services which are fully supported by state funds.
(2) No school district shall be required to participate in any service.
(3) School districts may enter into contracts with the education service cooperative for services supported partially or completely by local school funds.
(4) School districts within one (1) education service cooperative may also contract for services with another education service cooperative.