If a city board of education notifies the State Board of Education that it is dissolving itself, the State Board of Education shall adopt a plan of consolidation and merger of that city school administrative unit with the county school administrative unit in the county in which the city unit is located; provided, however, if a city school administrative unit located in more than one county notifies the State Board of Education that it is dissolving itself, the State Board shall adopt a plan that divides the city unit along the county line and consolidates and merges the part of the city unit in each county with the county unit in that county and the plans shall take effect on the same day. The plans shall be prepared and approved in accordance with G.S. 115C-67 as provided by general law, and G.S. 115C-68 as provided by general law, as applicable, except that the county and city boards of education and the boards of commissioners shall not participate by preparing, entering into, submitting, or agreeing to a plan, and the plan shall not be contingent upon approval by the voters. (1991, c. 689, s. 37(c).