Sec. 4. (a) This section does not apply to:
(1) a county in which a board of elections and registration is established; or
(2) a county containing a consolidated city.
(b) After June 30, 2011, the county executive may adopt an order by the unanimous vote of the entire membership of the county executive to:
(1) establish a board of registration; or
(2) rescind a previously adopted order establishing a board of registration.