Which of the Following Is True in Situations in Which

Which of the following is true in situations in which a principal was undisclosed and the third party comes to know of the undisclosed principal's identity, but proceeds to get a judgment against the agent?

A) The principal is liable to the third party anyway.
B) The principal is liable to the third party only if the agent does not pay.
C) The principal is liable to the third party only if the agent files for bankruptcy.
D) The principal is released from liability to the third party.
E) The principal is released from liability unless a contract for personal service was involved.