Final answer:
The duty not considered part of a broker's fiduciary responsibility is ensuring all transaction parties are satisfied; instead, their responsibilities include loyalty, confidentiality, and other legal obligations towards the principal.
Step-by-step explanation:
The duty that is NOT considered part of the broker's fiduciary responsibility to the principal is to ensure that all parties involved in the transaction are satisfied with the deal. A broker's fiduciary duties primarily revolve around loyalty, confidentiality, disclosure, obedience, accounting, and reasonable care towards the principal. Ensuring the satisfaction of all parties, while good practice, doesn't fall under the legal obligations that a broker owes to their principal.