The school board of Loudoun County shall be elected as provided in § 22.1-57.3, except that upon a majority vote of its members the terms of school board members may be staggered as provided in this section. At the November election immediately preceding the end of the board’s term, and upon the board’s prior vote for staggered terms, the members from four of the nine districts, inclusive of the at-large district, to be determined by lot by the electoral board of the county prior to its meeting immediately preceding the deadline for candidate filing, shall be elected for four-year terms, and the remaining districts’ successful candidates shall be elected for two-year terms. Thereafter, all members shall be elected for four-year terms, and the school board elections shall be conducted biennially for staggered terms.