From whom can Salesperson Nancy legally demand a performance bonus for her efforts in negotiations?

In the context of real estate practice, a salesperson typically does not have the legal standing to demand a performance bonus from any parties involved in a transaction. Instead, a performance bonus or commission is typically based on a prior agreement or a contract between the salesperson and their employing broker. This means that any compensation, including bonuses, is governed by the terms set forth in the employment agreement with the broker, not directly from sellers or buyers. Salespersons are generally not in a position to assert such demands from clients since their relationship with clients is usually regulated by their broker's policies and the agreements in place.

Hence, the correct answer indicates that Salesperson Nancy cannot legally demand a performance bonus from anyone involved in the transaction. This highlights the importance of understanding the nature of relationships in real estate transactions, where compensation is usually directed through the broker rather than directly from clients.