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