To Avoid Being Bound by the Acts of the Agent

To avoid being bound by the acts of the agent after the agency has ended,the principal should give constructive notice:

A) to those who have dealt with the former agent.
B) to those who knew of the agency but had never dealt with it before termination.
C) to those who never knew of existence of the agency.
D) to everyone who the principal was in contract with before the termination.