(a) Except as provided by (b) of this section, appointments and promotions of municipal employees are made on the basis of merit. The governing body may provide for a personnel system and classified service.
(b) By ordinance the governing body may designate confidential or managerial positions that are wholly or partially exempt from the classified service. A wholly or partially exempt position is filled by a person who serves at the pleasure of the appointing authority and whose term of employment is determined by the appointing authority.