The regional center shall secure services for its clients in the least restrictive environment consistent with individualized habilitation plans. As a result of its comprehensive evaluation, the regional center shall utilize the following entities to secure services:
(1) Agencies serving persons not diagnosed with an intellectual disability or developmental disability in which the client would be eligible to receive available services or in which the services could be made available to the client through the purchase of assistive or supportive services;
(2) Agencies serving persons with an intellectual disability or developmental disability in which the client would be eligible to receive available services or in which services could be made available to the client through the purchase of assistive or supportive services;
(3) The regional center on a day-program basis;
(4) The regional center for short-term residential services, not to exceed six months, unless expressly authorized for a longer period by the division director;
(5) A residential facility licensed through the department placement program, but not operated by the department;
(6) A developmental disability facility operated by the department for clients who are persons with an intellectual disability or developmental disability.