A municipality is a Type C general-law municipality if it:
(1) has incorporated as a Type C general-law municipality under Subchapter A of Chapter 8 and has not acted to change to another type of municipality;
(2) has changed to a Type C general-law municipality under Subchapter B of Chapter 8 and has not acted to change to another type of municipality; or
(3) operated, immediately preceding September 1, 1987, under Chapter 12, Title 28, Revised Statutes, and has not acted to change to another type of municipality.