The classified service shall comprise all offices and positions in the Unified Court System except justices, judges, county clerks and housing judges appointed pursuant to section 110 of the New York City Civil Court Act. The offices and positions in the classified service of the Unified Court System shall be divided into four classes, to be designated as the exempt class, the noncompetitive class, the labor class and the competitive class. The Chief Administrator of the Courts shall determine the appropriate class for each job title in the Unified Court System.