A. The approving authority shall be:
(1) for an infrastructure development zone located entirely within one county and outside a municipality, the governing body of that county;
(2) for an infrastructure development zone located entirely within a municipality, the governing body of that municipality;
(3) except as provided in Subsection B of this section, for an infrastructure development zone that is not described in Paragraph (1) or (2) of this subsection and of which the majority of its acreage lies outside a municipality, the governing body of the county containing the most acreage outside of a municipality; or
(4) except as provided in Subsection B of this section, for an infrastructure development zone that is not described in Paragraph (1) or (2) of this subsection and of which the majority of its acreage lies within a municipality, the governing body of that municipality.
B. For an infrastructure development zone that is not described in Paragraph (1) or (2) of Subsection A of this section, in lieu of the approving authority designated pursuant to Paragraph (3) or (4) of that subsection, all of the governing bodies that approved the petition and service plan of the infrastructure development zone may jointly designate a governing body, in the zoning jurisdiction of which lies any portion of the infrastructure development zone, as the approving authority.