Section 3--117. Instruments Payable With Words of Description. An instrument made payable to a named person with the addition of words describing him

(a) as agent or officer of a specified person is payable to his principal but the agent or officer may act as if he were the holder;

(b) as any other fiduciary for a specified person or purpose is payable to the payee and may be negotiated, discharged or enforced by him;

(c) in any other manner is payable to the payee unconditionally and the additional words are without effect on subsequent parties.