(a) Territory may not be annexed to the district unless:
(1) an election is held in accordance with this subchapter; and
(2) the annexation is approved by a majority of the voters voting in the election in:
(A) the district; and
(B) the territory proposed to be annexed.
(b) If the territory is annexed to the district, a certified copy of the order canvassing the returns of the election shall be filed and recorded in the deed records of each county in which the district is located following the annexation election.
(c) An election may not be held under this subchapter within six months of an election previously held under this subchapter.