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 purchase a property, which outlines the terms under which they are willing to buy. However, it does not establish the commission for the agent or include an expiration date, nor is it signed by the seller as a formal agreement; rather, it requires acceptance from the seller to become binding.

A contract to sell typically outlines the terms of sale once the buyer and seller have agreed on the sale of the property. While it may involve commission details and is signed by both parties, it is not the initial agreement that establishes the relationship between the seller and the agent, nor does it specifically detail the agent's commission or an expiration date.

An option agreement gives a buyer the right, but not the obligation, to purchase a property at a predetermined price within a set timeframe. This type of contract does not typically involve commission details or serve as a listing agreement, making it irrelevant to the context of the seller-agent relationship in property sales.