Answer: Interpleader
Explanation:
The broker just engaged in an Interpleader action which is an action that allows a person who does not own a certain property to get the claimants to the property to go to court for it. The Court will then decide who should get the property after proceedings.
The Broker does not own the deposit but seeing as he did not want to get into trouble with either the Seller or the Buyer, he put the deposit with the courts so that they would decide who owns the deposit.