Apparent authority may exist only if the agent has express authority conferred by the principal either orally or in writing if the principal's conduct causes a third person to reasonably believe that another has the authority to act on the principal's behalf only if the agent has actual authority established in a written agreement between the principal and the agent if the principal reasonably believes that the agent has the authority to act on the principal's behalf Question 28 1 pts For ratification to be effective, the agent must have the capacity to complete the unauthorized act and ratify it principal must be a corporation, a limited liability company (LLC), or a professional limited liability company (PLLC). agent cannot disclose the name of the principal principal must have been in existence at the time of the agent's action