If someone agrees to act as a mediator between the two parties to the conflict, then he must waive the right to defend either party after the fact, because defending one party after mediation is tantamount to pretending fairness is pretended. Which of the following is the most emphasized in the above discussion? ['The mediator must not have any opinion on the contradiction between the two parties to the dispute.', "You cannot be a good mediator if you can't maintain a fair attitude.", 'The mediator must fully comply with the opinions of the two parties to the conflict,.', 'If the mediator makes his bias public, he can defend one side of the argument.']