The zoning authority, within its jurisdiction, may:
A. act as a zoning commission;
B. designate the planning commission to act as a zoning commission; or
C. appoint a zoning commission, which shall recommend the boundaries of the various original districts and the regulations necessary to enforce the zoning restrictions. The zoning commission shall make a preliminary report and hold a hearing on the preliminary report before the report is submitted to the zoning authority for action.