16. In an action in rem, the writ of summons shall be served-

(a) Upon ship, or upon cargo, freight, or other property, if the cargo or other property is on board a ship, by attaching an office copy of the writ to a mast, or to some other conspicuous part of the ship;

(b) Upon cargo, freight, or other property, if the cargo or other property is not on board a ship, by attaching an office copy of the writ to some portion of such cargo or property;

(c) Upon freight in the hands of any person, by leaving with him an office copy of the writ;

(d) Upon proceeds in Court, by leaving an office copy of the writ with the Registrar of the Court.