Which of the Following Is NOT a Requirement for Ratification

Which of the following is NOT a requirement for ratification of an unauthorized contract or act involving an agent and a third party?

A) The principal must know of all material facts involved in the transaction.
B) The principal must have the legal capacity to authorize the transaction at the time the agent engages in the act.
C) The principal's affirmance must occur prior to the withdrawal of the third party from the transaction.
D) The principal must be a disclosed principal.