Once a union is the bargaining agent for a unit, whom must it represent fairly?

1. Certification makes the union the exclusive bargaining agent for everyone in the defined unit. 2. Because representation is exclusive, no worker in the unit can bargain separately with the employer. 3. The union therefore owes fair representation to all workers in the unit. 4. That duty extends to those in the unit who never became members. 5. It is exactly this duty that justifies the agency fee, since non-members receive representation they have not paid dues for. 6. Options A, B, and D all shrink the duty to a subgroup, which would leave part of the unit represented by nobody. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 8 "Managing Human Resources and Labor Relations", section Union Security_