In the first stage of a negotiation, both parties have to Select one: a. set an agenda. b. agree on what to do if an agreement is not reached. c. discuss what is not acceptable in the negotiation. d. establish their BATNA.

a. set an agenda

Explanation:

Preparation and planning are the one of the most so important steps in the negotiation phase and is an important definition and ground rules and classification and justification and closure and implementation. And this is included in setting the agenda and clearly does the aims and objectives and list the topics and allowing for the adequate time. Setting the agenda is an essential aspect of the negotiation process.

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