Which items are typically referred to as permissive subjects?

Permissive subjects refer to topics that can be negotiated by employers and unions, but are not required to be discussed under labor law. These subjects are often related to the broader context of employment terms rather than mandatory issues, such as wages or working conditions.

In the context of the chosen answer, definitions of bargaining units and retiree health insurance fit the description of permissive subjects because they pertain to the structure and scope of union representation and employee benefits that are typically negotiable but not compulsory. This implies that organizations can decide whether or not to engage in negotiations about these topics without being obligated by law to do so.

In contrast, the other options generally deal with areas that are considered mandatory subjects of bargaining. Wages and benefits are fundamental components of labor negotiations that unions have the legal right to bargain for. Overtime calculations and safety protocols are also mandatory since they directly affect working conditions and employee rights. Employee termination procedures would likewise fall under mandatory negotiations as they are critical to employee job security and due process. Hence, the choice regarding definitions of bargaining units and retiree health insurance accurately reflects the characteristics of permissive subjects.