Final answer:
Jan is an incorporator because they signed the articles of incorporation for the corporation being formed.
Step-by-step explanation:
Jan, who signs the articles of incorporation for a corporation, is considered an incorporator. An incorporator is an individual who takes the necessary steps to create the corporation. On the other hand, a promoter is someone who brings together the necessary elements for the formation of the corporation, such as finding potential investors. A registered agent is a person or entity designated by the corporation to receive legal documents on its behalf. Lastly, a shareholder is someone who owns shares or stock in the corporation.