No city may change from the council-manager form of government within two years after the adoption thereof. At the end of that period, or at any time thereafter, the city may change its form of municipal government either to:

1. (1) The form of municipal government applicable to the city prior to its adoption of the council-manager form of government, or to
2. (2) The mayor-council form of municipal government provided enabling legislation has been enacted.
3. (3) One of the commission forms of municipal government provided by Title 11 and supplemented.

(Acts 1977, No. 71, p. 78, § 10.01.)