a. Any municipality adopting a mayor-council plan of government may provide in its charter that the council members elected at the first regular municipal election or general election, as the charter shall provide, following the adoption of the plan shall serve for the following terms: if the municipal council is to consist of five members, two shall serve for four years and three for two years; if the municipal council is to consist of seven members, three shall serve for four years and four for two years; or if the municipal council is to consist of nine members, four shall serve for four years and five for two years. The length of the respective term of each member of the first council shall be determined by lot at the organization of the council immediately following the election.
b. Notwithstanding the provisions of subsection a. of this section, if a municipality adopting the provisions of this section shall also provide in its charter that the municipality shall be divided into wards pursuant to the authority granted in section 1-13 or 1-19 (C.40:69A-13 or 40:69A-19), the council members elected at the first regular municipal election or general election, as the charter shall provide, following the adoption of the plan shall serve as follows: the council members elected at large for a term of four years; and the council members elected from wards for a term of two years.