Answer:
a. the pre-negotiation stage, managing the actual negotiations, and managing the agreement stage
Explanation:
A multilateral negotiation is the one, in which the parties are more than or equal to 3 in number.
Therefore, when there is an agreement between three or more countries then to conclude such agreement, all the parties are required to agree on terms.
Thus, for this there are three stages of such multilateral agreement.
The first stage is Pre-negotiation stage in which before negotiation, basic terms and conditions are prepared by each party involved.
Then actual negotiations are presented and discussed. An after such discussion the final negotiations accepted by all are accumulated and formed in the agreement.