The following correct statement about stowage of 20ft and 40 ft containers is _______.

A、40ft container cannot be stowed on 20 ft container.;

B、20ft container can be stowed on 40ft container;

C、Whether a 40ft container can be stowed on 20ft container is determined by the cell guide structure and location of foundation.;

D、20ft container and 40ft container cannot be mixed in stowage.