Operating agreement" means any agreement, written or oral, among all of the members, as to the conduct of the business and affairs of a limited liability company. If a limited liability company has only one (1) member, an operating agreement shall be deemed to include:
(a) A writing executed by the member that relates to the affairs of the limited liability company and the conduct of its business regardless of whether the writing constitutes an agreement; or
(b) If the limited liability company is managed by a manager, any other agreement between the member and the limited liability company as it relates to the limited liability company and the conduct of its business, regardless of whether the agreement is in writing;