A client wants to give a broker a listing to sell a house, but wants to retain the right to sell it to a sibling without paying a commission. What is the broker's most appropriate course of action?

This option is not advisable as it places the broker in a passive role, lacking any formal agreement with the client. Without a listing agreement, the broker may miss the opportunity to secure a commission if the client decides to sell to someone other than their sibling.

This choice implies a conditional approach that may leave the broker without a formal agreement initially. An exclusive right-to-sell listing should be established upfront to ensure clarity on commission rights, rather than waiting for potential disagreements.

An exclusive agency listing allows the client to sell the property themselves without paying a commission if they find a buyer, which contradicts the client's desire to retain the right to sell to a sibling without commission. This agreement would not adequately protect the broker's interests.

An open listing does not guarantee the broker any commission, as it allows multiple brokers to work on the same property. This option doesn't align with the client's intent to ensure a commission for the broker while retaining certain selling rights.