“Officer” means either of the following:
(a) When used with respect to a corporation, any person appointed or designated as an officer of the corporation by or pursuant to applicable law or the articles of incorporation or bylaws of the corporation or any person who performs with respect to the corporation functions usually performed by an officer of a corporation.
(b) When used with respect to a specified person other than a natural person or a corporation, any person who performs with respect to the specified person functions usually performed by an officer of a corporation with respect to the corporation.