Except as otherwise provided in this chapter, the articles of organization or the operating agreement, no debt may be contracted or liability incurred by or on behalf of a limited-liability company or any series thereof except by:
1. One or more managers of a company or series which is managed by a manager or managers;
2. Any member of a company or series which is managed by its members;
3. Any agent, officer, employee or other representative of the company or series, as authorized in the operating agreement or in another writing by a manager or managers, if the company or series is managed by a manager or managers; or
4. Any agent, officer, employee or other representative of the company or series authorized in the operating agreement or in another writing by a member thereof, if the company or series is managed by its members.