All school administrative units shall comply with the requirements of RSA 194:3-f and RSA 194:3-g relative to the closure of elementary and high schools. I. For the purposes of this section: (a) Elementary schools are the same as defined in RSA 189:25. (b) High schools are the same as defined in RSA 194:23. II. Single district school administrative units shall be exempt from the requirements of RSA 194:3-g if the single district school administrative unit serves only a single municipality.