(a) A person becomes a limited partner: (1) Upon formation as provided in the partnership agreement; or (2) After formation, a person becomes a limited partner: (A) As provided in the partnership agreement; (B) As the result of a merger under subchapter X of this chapter or a transaction under Chapter 2 of this title; (C) With the consent of all the partners; or (D) As provided in § 29-708.01(4). (b) A person may become a limited partner without: (1) Acquiring a transferable interest; or (2) Making or being obligated to make a contribution to the limited partnership.