Pursuant to the provisions of sections 355.01 to 355.07, the governor shall designate an agency to supervise a referendum for each of the following groups:

1. (a) The public employees retirement association shall be deemed a single retirement system with respect to the political subdivisions and the state having positions covered thereby.
2. (b) The state employees retirement association shall be deemed a single retirement system except as provided in paragraph (c).
3. (c) The employees of the University of Minnesota covered by the state employees retirement association shall be deemed a single retirement system.
4. (d) The teachers retirement fund shall be deemed a single retirement system with respect to the state departments, institutions, and political subdivisions having positions covered thereby except as provided in paragraph (e).
5. (e) The educational employees of the state universities covered by the teachers retirement fund.