A buyer's agent must notify the selling broker about their agency status...

The correct answer is that a buyer's agent must notify the selling broker about their agency status before any promotional activities for the property begin. This requirement emphasizes transparency and professionalism in real estate transactions.

When promotional activities start, it is crucial for all parties involved to be aware of who is representing whom in the transaction. It fosters open communication and helps prevent potential conflicts of interest. This notification allows the selling broker to understand the role of the buyer's agent and ensures that all marketing and negotiations are conducted in a manner consistent with the established agency relationships.

Notifying during the initial appointment of the buyer or at the final closing would not capture the importance of establishing agency status at the onset of marketing the property. Similarly, notifying only if the buyer is absent at the closing would neglect the ongoing obligation to communicate this information at the appropriate time, which is crucial for maintaining a professional standard and protecting the interests of all parties involved.