The correct answer would be, duty of fair representation.
The union steward helped him throughout the case until he settled the matter in the bargaining unit. Such an act shows adherence to duty of fair representation.
Explanation:
If there are unions in any organization, then it is the sole duty of the union leader and representatives to represent case of every labor worker to the management even if he or she is not the part of that union.
It is mandatory for the leader of the union to represent the case of all workers fairly without any discrimination.
So when Justin has a problem and filed a grievance against the management, the union steward helped him throughout the case until he settled down the matter with the bargaining unit, even Justin was not the part of the union at his workplace This shows adherence to duty of fair representation.
Learn more about Unions in Organizations at:
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