(a) If, after the public hearing, the governing body determines that the annexation to the municipal corporation of the area proposed in the application would be in the best interest of the residents and property owners of the area proposed for annexation and of the citizens of the municipal corporation, the area may be annexed to the municipal corporation by the adoption of an annexing ordinance.

(b) The annexing ordinance authorized by subsection (a) of this Code section shall be adopted within 60 days following validation of the signature of the applicants.