Elizabeth, an employee at an investment firm, was not promoted despite receiving a high appraisal rating. However, her male coworker was promoted even though he received an average rating. Elizabeth believed this to be a case of gender discrimination and brought it up with her supervisor, who denied any such claim. As a result, the firm brought in Reggie, an independent arbitrator, to resolve the problem between Elizabeth and her supervisor. In this scenario, Reggie is $.$