Where a union contract requires ADR to settle a dispute, the person who files the grievance may faceGroup of answer choicesA decision by a mediator who makes a binding decision after hearing witness and reviewing the evidenceA decision by an arbitrator who facilitates a nonbinding settlement by working with the parties to sort out the issuesA decision by an arbitrator who facilitates a binding settlementA binding decision by an arbitrator who hears witnesses, reviews the evidence and makes a binding decision