Sec. 504.011. METHOD OF PROVIDING COVERAGE. A political subdivision shall extend workers' compensation benefits to its employees by: (1) becoming a self-insurer; (2) providing insurance under a workers' compensation insurance policy; or (3) entering into an interlocal agreement with other political subdivisions providing for self-insurance. Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.