In Negotiation, It May Be Said with Certainty That

In negotiation, it may be said with certainty that:

A) There is one package of personality attributes that make one an effective negotiator.
B) There is one right way to conduct negotiations.
C) There are facets of each temperament that, improperly managed, may impede effective mutual negotiation resolution.
D) It is very likely that introverts will need to improve patience.