Final answer:
After the closing of the house, Abby still owes a duty of confidentiality to the buyer from the buyer representation agreement, keeping all sensitive information shared private.
Step-by-step explanation:
When Abby enters into a buyer representation agreement with a buyer, she assumes certain fiduciary duties that persist even after the transaction is completed. While the duty of loyalty and full disclosure are paramount during the representation, the duty of confidentiality extends beyond the closing of the house. Therefore, Abby still owes a duty of confidentiality to the buyer after they close on the house, ensuring that any sensitive information shared during the transaction process remains private.