Sec. 43. A plan approved by:
(1) a county committee or committees; and
(2) the state board before May 1, 1984;
may provide for or be amended to provide for delaying the commencement of the terms of some members of the governing body for one (1) year and for extending the terms of their predecessors for one (1) year where this is necessary to prevent a majority of the board from taking office at any one time.