(2)(a) If the boundaries of a prosecution district are located entirely within one county, the district attorney of the prosecution district is an elected officer of that county.

     (2)(b) If the boundaries of a prosecution district include more than one county, the interlocal agreement that creates that prosecution district in accordance with Section 17-18a-602 may designate the district attorney as an elected officer in one or more of the counties in which the prosecution district is located.

     (3)(a) is a full-time employee of the prosecution district; and

     (3)(b) may not engage in the private practice of law.

     (4)(a) serve as a part-time employee; and

     (4)(b) engage in the private practice of law, subject to Section 17-18a-605 and the Rules of Professional Conduct.