The type of listing agreement that provides the least protection for the listing broker is?

The correct answer is the type of listing agreement known as an open listing. In an open listing arrangement, the property owner retains the right to sell the property themselves and can also list the property with multiple brokers simultaneously. This means that the listing broker only earns a commission if they are the one who brings a buyer to the table. If the owner sells the property independently or if another broker sells it, the original listing broker does not receive a commission, which provides minimal protection for the broker.

In contrast, the exclusive right to sell listing ensures that one broker is entitled to the commission regardless of who sells the property. An exclusive agency listing gives one broker the right to sell but still allows the seller to sell independently without owing a commission to the broker. A multiple listing service typically involves sharing the listing across numerous agents, providing significant exposure and thus also more protection to the brokers involved. Since an open listing offers the least security for the listing broker, it is the choice that aligns with the question.