Which of the following is a responsibility of the Federal Mediation and Conciliation Services’ Office of Arbitration Services? a. investigating details of a dispute and based on that, selecting a suitable arbitrator for the dispute b. maintaining a roster of arbitrators qualified to hear and decide labor questions in labor– management disputes c. evaluating the merits of the underlying grievances submitted for arbitration d. determining the accuracy of the decision given by the arbitrator and then approving the decision so that it becomes binding on both the parties