Answer:
The Answers are,
A, B, C, D
Explanation:
When the conflicted two (or more) parties are negotiating, this may get explosive and conflicts could arise during the process. An impartial 3rd party can act as a "judge" and create a cooling off period when this happens.
Moreover, when the heat is on the rise during a tough negotiation, other matters which are not the central focus of the subject matter might come up. A 3rd party can easily re-route this back to the main topic.
Furthermore, the two or more parties at the negotiation may have a troublesome and a conflicting past that their relationship may have been damaged severely. A 3rd party can intervene on behalf of these parties and offer to settle the matters in a non aggressive, civil way.