Which of the following involves an undisclosed principal?

Kevin hires Lucy to act as his realtor and together they meet with a seller of a house in Wilmington.

Elizabeth is an attorney who sends a letter to Brendon on behalf of Michael.

Jason acts on his own behalf when he prepares his report to a potential employer with the aim of obtaining a consulting position.

Tara is hired by Big Corporation to negotiate terms of an agreement, and is under strick instructions not to inform the other party about her connection to Big Corporation.