1. Normal workdays and hours of employment therein;

2. Holidays;

3. Days of vacation allowed;

4. Days of sick leave allowed;

5. Other provisions concerning the hours and conditions of employment;

6. Plans of personnel management and control;

7. Systems of retirement for all or any classes of officers and employees of the county but the adoption of the urban county executive form of government shall in no way affect any retirement system in effect in any such county prior to the date of adoption of such form; and

8. Notwithstanding any other provision of law, such employee benefit programs as it deems appropriate. In connection with some or all of such employee benefit programs, the county may enter into voluntary salary reduction agreements with its officers and employees when such agreements are authorized under the laws of the United States relating to federal income taxes. Any such voluntary salary reduction agreements entered into prior to January 1, 1988, are hereby validated.