(4) "Managerial employees" are those employees who:
(a) Perform jobs that are not of a routine, clerical, or ministerial nature and require the exercise of independent judgment in the performance of such jobs and to whom one or more of the following applies:
1. They formulate or assist in formulating policies which are applicable to bargaining unit employees.
2. They may reasonably be required on behalf of the employer to assist in the preparation for the conduct of collective bargaining negotiations.
3. They have a role in the administration of agreements resulting from collective bargaining negotiations.
4. They have a significant role in personnel administration.
5. They have a significant role in employee relations.
6. They are included in the definition of administrative personnel contained in s. 1012.01(3).
7. They have a significant role in the preparation or administration of budgets for any public agency or institution or subdivision thereof.
(b) Serve as police chiefs, fire chiefs, or directors of public safety of any police, fire, or public safety department. Other police officers, as defined in s. 943.10(1), and firefighters, as defined in s. 633.102, may be determined by the commission to be managerial employees of such departments. In making such determinations, the commission shall consider, in addition to the criteria established in paragraph (a), the paramilitary organizational structure of the department involved.
However, in determining whether an individual is a managerial employee pursuant to paragraph (a) or paragraph (b), above, the commission may consider historic relationships of the employee to the public employer and to coemployees.