During the meeting phase of price negotiation, a buyer's and a seller's reservation prices are already established, but it turns out that the range of possible deals is narrow. What is an example of a mutually beneficial concession that would transform the negotiation process from distribution negotiation to a win$-$win negotiation?

The buyer agreeing to pay the higher price only for the first order

The seller agreeing to a lower unit price provided the buyer commits to purchasing a larger number of units

The seller making an inferior product to meet the buyer's required price point The buyer getting angry and threating to walk out of the deal unless he receives the price that he wants

The seller offering to pay the transportation costs for the buyer