Which of These Definitions Is the Least Accurate

Which of these definitions is the least accurate?

A) Parties choosing adjudicative ADR are choosing a method of dispute resolution where a solution will be imposed upon them.
B) Parties choosing non-adjudicative ADR are merely selecting a forum or process by which they are helped to reach a settlement devised by themselves.
C) Parties can only agree to a non-adjudicative ADR process after a dispute has arisen.
D) Parties can agree before any dispute arises between them which form of non-adjudicative ADR they must have in the event that a dispute arises.