Upon expiration of a listing agreement, a listing agent:

When a listing agreement expires, the listing agent is still bound by confidentiality regarding the seller's information. This obligation typically extends beyond the term of the listing agreement itself. Agents are required to protect their clients' confidential information, which includes details about the seller's financial situation, motivations for selling, and any other sensitive data shared during the course of the listing.

This ongoing duty of confidentiality ensures that former clients' interests are safeguarded, regardless of whether the agent is actively representing the seller at that moment. Therefore, the correct understanding is that the listing agent cannot disclose the seller's confidential information, maintaining trust and integrity within the professional relationship.

The other options do not align with standard practices in real estate. For instance, continuing to market the property after the agreement has expired would typically require a new agreement or the property being re-listed. Ceasing all communication with potential buyers is not practical or necessary once the agreement has concluded, as the agent may still want to assist buyers in their search for similar properties. Finally, representing both the buyer and seller generally requires proper consent and is not an automatic right for the agent after the listing expires.