Final answer:
The listing contract that offers the least amount of protection to the broker is the Open Listing, while the Exclusive Right to Sell Agreement offers the most protection.
Step-by-step explanation:
The listing contract that offers the least amount of protection to the broker is the Open Listing. In an open listing, the seller can work with multiple brokers and only the broker who brings the buyer gets a commission.On the other hand, in a Net Listing, the broker's commission is the excess amount above the seller's desired sale price. This type of listing is uncommon and may create conflicts of interest.
An Exclusive Right to Sell Agreement offers the most protection to the broker, as it guarantees the broker a commission regardless of who finds the buyer. And an Exclusive Agency Agreement allows the seller to find a buyer independently without paying a commission to the broker, providing some protection to the broker.