In which type of listing does the seller have more than one broker at the same time?

The type of listing where the seller has more than one broker working simultaneously is known as an open listing. In an open listing agreement, the property owner can engage multiple real estate agents to market their property, and the first broker who brings a buyer who completes the sale receives the commission. This arrangement allows for a competitive environment where brokers can work alongside each other without an exclusive commitment from the seller.

In contrast, exclusive right to sell and exclusive agency listings limit the seller to one broker or agent to represent them, thereby creating a more structured relationship where that broker is entitled to a commission under specific conditions. A multiple broker listing isn't a standard term recognized in the same way as the other types of listings and does not reflect the commonly understood real estate listing agreements. Thus, the open listing is the correct choice for this scenario.