In which situation must Broker A disclose his interest when selling property to Buyer B?

If Broker A's brother-in-law owns the property, it is considered a direct interest and must be disclosed. If Broker A owns the property, it is also a direct interest and must be disclosed. If Corporation C owns the property and Broker A is part owner of the corporation, this is considered an indirect interest and must also be disclosed. Options B, C, and D do not require Broker A to disclose any interests as there is no direct or indirect involvement in the property in those situations.