(a) Any town which is a member of a regional school district may, pursuant to a vote of its legislative body, apply to the regional board of education to institute procedure for withdrawal from the district or, in the case of a district composed of two towns, dissolution of the district as hereinafter provided.
(b) Any two or more towns which are members of a regional school district composed of three or more towns may, pursuant to a vote of the legislative bodies of the respective towns, apply to the regional board of education to institute procedure for the dissolution of the district as hereinafter provided.