Test The Harvard Model: insisting on objective criteria

QUESTION 1: What is the fourth and final principle of the Harvard Negotiation Model?

Because they feel pressured to accept logic
Because the conversation focuses on logic and facts, not on emotions or personal interpretations
Because objective criteria always benefit both parties equally
Because it is the fastest method

Because it fits the needs and the other person feels valued by having the option to choose
Because it is imposed by force
Because it is the only option available
Because it is based on the emotions of the moment