A. Any redistricting, other than the decennial redistricting, of any county, city, or town shall be effective at midnight December 31 of the year in which the redistricting occurs.
B. Members of county, city, and town governing bodies in office when any such redistricting measure is adopted shall complete their terms of office. The elections for their successors shall be held at the general election next preceding the expiration of the terms of office of the incumbent members and shall be conducted on the basis of the districts set out in the measures to accomplish the redistricting.
C. When a county has been redistricted as a result of annexation and the redistricting occurs in the year of a regularly scheduled November general election for members of the county’s board of supervisors, the November general election shall be conducted from the newly established districts so long as the redistricting measure has been adopted prior to March 15 of the year of the election.
D. When a city or town has been redistricted as a result of annexation and the redistricting occurs prior to a regularly scheduled May general election for members of the city’s or town’s governing body, the May general election shall be conducted from the newly established districts so long as the redistricting measure has been adopted prior to the November 15 immediately preceding the election.