Agents May Expose Themselves to Personal Liability on a Contract

Agents may expose themselves to personal liability on a contract by entering into an agreement with a third party

A) without disclosing the fact that they are an agent.
B) by expressly describing themselves as an agent,but without disclosing the identity of the principal.
C) on behalf of a fictitious principal.
D) on behalf of a principal for whom the agent did not have authority to act.
E) All of the responses are correct.