All of the following except which one is a duty of an agent?

A) Account for money received on behalf of his principal.
B) Inform his principal of any information relevant to his agency.
C) Refrain from competing with his principal.
D) After the agency is terminated, refrain from using any information gained while an agent.

Duty D, refraining from using any information gained while an agent after the agency is terminated, is not a general duty of an agent. The primary duties of an agent include accounting for money received on behalf of the principal, informing the principal of relevant information, and refraining from competing with the principal. However, the obligation regarding the use of information after termination of the agency can vary based on the terms of the agreement and specific laws, but it is not considered a general duty like the others listed.