(1) The purpose of this act is to establish optional forms of county government in compliance with section 12, article XVIII of the Idaho constitution. In addition to the original three (3) member board of county commissioners form of county government authorized by the constitution and laws of the state of Idaho before the enactment of section 12, article XVIII of the Idaho constitution, the following shall be the exclusive optional forms of county government:
(a)  The commission-executive, as authorized in chapter 52, title 31, Idaho Code;
(b)  The commission-manager, as authorized in chapter 53, title 31, Idaho Code;
(c)  The three-member board of county commissioners with changes in other county offices, as authorized in chapter 54, title 31, Idaho Code;
(d)  The five-member board of county commissioners, as authorized in chapter 55, title 31, Idaho Code;
(e)  The seven-member board of county commissioners, as authorized in chapter 56, title 31, Idaho Code;
(f)  Consolidation of offices among counties, with all other characteristics of the government of each participating county to remain unchanged, as authorized in chapter 57, title 31, Idaho Code.
(2)  The adoption of an optional form of county government shall not relieve a county from the performance of the duties and responsibilities imposed upon the county, the board of county commissioners or any elected officer of the county by the constitution and laws of the state of Idaho.