What form can a seller use to negotiate with multiple buyers simultaneously?

The multiple counter-proposal is the correct choice because it allows a seller to present offers to more than one buyer at the same time. This strategy enables the seller to gauge multiple bids and negotiate effectively with each interested party, maximizing competition and potentially leading to better offers. In this scenario, the seller can respond to various offers, giving each buyer an opportunity to improve their terms or price, ultimately benefiting the seller's position in the negotiation process.

The other options do not facilitate simultaneous negotiations with multiple buyers. The standard purchase agreement is typically a final agreement between a buyer and seller and does not provide room for negotiation with multiple parties concurrently. A single counter-offer is directed toward one buyer, thus closing off negotiations with others. The exclusive listing agreement establishes a relationship with a single agent or broker to sell the property but does not inherently involve direct negotiation strategies with multiple buyers.