joe is a sales agent. he's hosting an open house at a client's property. a potential buyer comes in and inquires about another listing that joe has. the buyer is represented by another sales agent, but joe doesn't know this fact. is joe required to disclose who he represents to the potential buyer and why? a) no, the potential buyer is represented by another sales agent. b) yes, joe must give the iabs notice to all potential buyers regardless of whether they are represented. c) yes, joe must disclose who he represents at the first contact with another party. d) no, the potential buyer walked into an open house.