Which duty is NOT part of the unique obligations in a single agent relationship?

In a single agent relationship, the agent has a specific responsibility to represent one party exclusively, which inherently prevents them from representing both parties in the transaction. This principle guides the agent's conduct and decision-making process to ensure that they are solely focused on the interests of their designated client.

The obligations of a single agent include duties such as obedience, which requires the agent to follow the lawful instructions of their client; skill, care, and diligence, signifying that the agent must perform their tasks with the appropriate level of expertise and attention; and the duty to account for funds, ensuring that the agent manages and discloses any financial transactions accurately and transparently.

Since a single agent cannot represent both the buyer and the seller, representation of both parties does not align with the key duties associated with this type of relationship. Thus, this choice correctly identifies a duty that is not part of the unique obligations of a single agent.