Final answer:
A broker who represents a buyer should advise them if the listed price of a house is unrealistic and refrain from disclosing the buyer's maximum price or personal information irrelevant to the transaction.
Step-by-step explanation:
A broker who is an agent of the buyer should advise the buyer if the listing price of the seller's house is unrealistic. This responsibility falls under the broker's duty to act in the buyer's best interest by providing professional expertise and guidance during the transaction.
Moreover, the broker should not disclose the maximum price the buyer is willing to pay, as this violates the fiduciary duty of confidentiality owed to the buyer. Disclosing that the buyer is a minority person is not relevant to the transaction and may contravene fair housing laws. Presenting only acceptable offers to the seller does not align with the broker's role, which is to present all legitimate offers from the buyer.