Which of the following strategies can be used to manipulate the effect an audience can have?

A) Limit one's own concessions by making negotiations invisible to the constituency.
B) Do not allow the constituency to demonstrate their commitment to the bargaining position.
C) Give the negotiator unlimited authority.
D) Increase the possibility of concessions by cutting off visibility to audiences.
E) None of the above tactics can be used to manipulate audience visibility.

By cutting off visibility to audiences, the negotiator will increase the possibility of concessions. This is because audiences can exert pressure on negotiators to maintain a strong bargaining position, so by limiting their visibility, negotiators can manipulate their influence on the negotiation outcome. Choices A, B, and C are incorrect as they do not relate to manipulating audience visibility. Choice E is incorrect as the question specifically asks about tactics that can be used to manipulate audience visibility.