What Is the Role of the Arbitrator in Assessing Whether

What is the role of the arbitrator in assessing whether the penalty imposed upon a unionized employee by their employer was appropriate in the circumstances?

A) to look for evidence of progressive discipline
B) to order reinstatement without loss of pay, benefits, or seniority
C) to assess why the grievance process failed
D) to fashion a remedy somewhere between dismissal and reinstatement