What kind of contract describes the property, states the amount of commission to be paid, states an expiration date, and is signed by the seller?

An offer to purchase is a proposal made by a buyer to buy a property, detailing the terms of the purchase including price and contingencies. However, it does not describe the property or include the commission terms, nor is it signed by the seller as part of a listing agreement.

A contract to sell typically refers to an agreement where the seller agrees to sell the property to a buyer under specified conditions. While it involves the transaction, it does not specifically include the commission details or serve as a listing authority for an agent.

An option agreement grants a buyer the right to purchase a property at a predetermined price within a specific timeframe. It does not outline the commission to be paid nor is it an agreement between a seller and an agent to list the property for sale.