Regional development centers are created and established as public agencies and instrumentalities of their members which shall facilitate coordinated and comprehensive planning in conformity with minimum standards and procedures established pursuant to law. Each such agency and instrumentality shall be known as a regional development center and shall be designated, by name for all purposes, with such identifying words before the term "regional development center" as the board may, from time to time in accordance with the provisions of subsection (f) of Code Section 50-8-4, choose and designate by official action. The number of regional development centers and the region within which each regional development center shall operate shall be established from time to time by the board of community affairs. The board of community affairs shall initially establish the boundaries of each region so that, for the period through June 30, 1990, each region will cover the same territorial area as covered by the regional development center's predecessor area planning and development commission in effect on June 30, 1989. Each county shall be wholly within the region of one regional development center, and no county shall be divided among more than one region. Without limiting the generality of the foregoing, the board of community affairs shall establish the boundaries of any region for which a metropolitan area planning and development commission, created pursuant to Article 4 of this chapter, also serves as the regional development center.