You are on a container vessel. What concerning the handling and stowage of containerized hazardous materials is TRUE?（）.

A. Open-bed containers may be used to transport hazardous materials if the cargo is properly secured
B. A portable cargo tank of a flammable，cryogenic liquid may not be in transit for a period exceeding its marked rated holding time unless the liquid is inhibited
C. A portable cargo tank containing a cryogenic liquid must be shipped on deck unless forced ventilation is provided to the tween-decks
D. A container loaded with packages of tear gas would display a placard reading Irritant