What legal concept allows a person to represent another regarding legal matters?

The correct answer is "Mandate" because it refers to a legal concept in which one person grants another the authority to act on their behalf in legal matters. In Louisiana law, a mandate creates a fiduciary relationship where the mandatary (the person receiving the authority) is obligated to act in the best interests of the mandator (the person providing the authority). This is particularly relevant in notarial practice, where notaries may often serve as mandates to assist individuals in executing legal documents or representing them in other formal legal capacities.

The concept of delegation, although it sounds similar, generally refers to the act of assigning responsibility or authority to another; however, it does not necessarily establish the same fiduciary relationship as a mandate. "Among other estates" does not pertain to legal representation but instead refers to various types of property ownership or interests. The term "transfer" more broadly indicates the movement of property or rights from one party to another and does not directly imply representation in legal matters. Therefore, "Mandate" is the most appropriate choice given its specific legal meaning in the context of representation.