In Negotiations, It Is Best to Decide Your Limit

In negotiations, it is best to decide your limit

A) After negotiations have begun so you can get a sense of what your options are
B) Before negotiations begin so you are not swayed by the pressure of the active negotiation
C) During the first break of the negotiations when you have a sense of your opponent
D) None of the above, it is important to not set limits and keep all possibilities on the table