Answer:
d. Attorney-in-fact.
Explanation:
An attorney-in-fact is an individual whom you authorize to engage in any business or private transaction on your behalf. This means that the attorney-in-fact represents you and if he/she does something in your name (e.g. sign contracts, take debts) it will be your responsibility. E.g. if the attorney-in-fact signs a contract on your behalf, your are a party in that contract and must perform your obligations.
