In Final Offer Arbitration

In final offer arbitration

A) the arbitrator can choose any outcome on his/her own, and it is final.
B) the arbitrator makes a final offer to each party, and they can accept or reject it.
C) each party makes a final offer, and the arbitrator chooses one of them.
D) each party decides on a final offer together, and then presents it to the arbitrator.
E) the arbitrator meets with each party and then makes a final offer.