Answer: All of the above.
Explanation: Here is the complete question:
A broker showed one of his own listings to a buyer he was representing. The buyer decided to make an offer on the property, which was accepted. At no point did the broker disclose his dual agency status. The broker may be:
a. forced to give up any payment received from the buyer and/or seller
b. sued by the seller
c. subject to disciplinary action by the Real Estate Commissioner
d. All of the above
A broker while dealing with the public should be open and give detailed information regarding a property. A broker should never remain silent concerning the material facts regarding a property that is only known to the broker.
In this scenario, the broker in question concealed the information about his dual agency status. He didn't open up to the buyer which isn't the right thing to do. In this case, the seller may sue the broker and the payment received for selling the property may be collected from him. For not disclosing his dual agency status, he may also be subject to disciplinary action by the Real Estate Commissioner.
Since all the options given are right, the answer is "all of the above".