Which of the following is correct regarding med-arb as a method of ADR?

Multiple Choice
To facilitate settlement of the case, med-arb utilizes both a mediator and an arbitrator in the same hearing.
In some cases, the same neutral third party may participate in both the mediation and the arbitration.
It is not recognized as a legitimate form of ADR in the United States.
If the case starts out in mediation, the mediator must also serve as the arbitrator of the dispute.
If the case starts out in arbitration, the arbitrator must also serve as the mediator of the dispute.