Which of the following documents MUST be signed and dated by a buyer and broker?

A letter of intent is typically a preliminary document that outlines the general terms of a future agreement but is not legally binding. While it may be signed by both parties, it does not carry the same weight or necessity as an exclusive buyer agency agreement, which is specifically designed to formalize the agency relationship.

An exclusive listing agreement is a contract between a seller and a broker, granting the broker the exclusive right to sell the property. While this document is important in real estate transactions, it is not relevant to the buyer-broker relationship and therefore does not require signatures from both a buyer and a broker.

A purchase and sales agreement is a legally binding contract between a buyer and a seller regarding the sale of property. Although it is crucial in real estate transactions, it is not specifically an agreement between a buyer and broker, which is why it does not fit the requirement of being signed and dated by both parties in this context.