Your examiner asks: "What are the segregation categories used in the IMDG Code, and what do they mean?"

A. Segregation terms describe segregation from crew accommodation only, not between different cargo classes.

B. IMDG segregation has only one category: "stow apart," with no graduated levels of separation.

C. Segregation categories apply only to Class 1 (Explosives); other classes have no segregation requirement between each other.

D. The IMDG Code segregation table uses terms including "Away from," "Separated from," "Separated by a complete compartment or hold from," and "Separated longitudinally by an intervening complete compartment or hold from" — each representing an increasing physical/spatial separation requirement between incompatible classes, applied via the segregation table cross-referencing hazard classes against each other.

A. Six classes, mirroring the IMSBC Code's Group A/B/C cargo classification.

B. Eight classes, ending at Class 8 (Corrosives) — there is no Class 9.

C. Nine classes: 1 Explosives, 2 Gases (2.1 flammable, 2.2 non-flammable non-toxic, 2.3 toxic), 3 Flammable liquids, 4 Flammable solids/substances liable to spontaneous combustion/substances dangerous when wet, 5 Oxidising substances and organic peroxides, 6 Toxic and infectious substances, 7 Radioactive material, 8 Corrosives, 9 Miscellaneous dangerous substances and articles.

D. The IMDG Code does not classify goods into numbered classes; classification is done solely by UN number with no class system.

A. Only if the segregation table requirement between the two substances' classes is satisfied by that vertical/positional arrangement — segregation is three-dimensional (it considers vertical as well as horizontal separation and any intervening deck/bulkhead), so a stricter segregation term (e.g. requiring a complete intervening compartment) could still be violated by stacking one directly above the other even though they are nominally "on deck" and "below deck."

B. Vertical stowage (above/below) is always outside the scope of IMDG segregation; segregation only ever applies horizontally on the same deck.

C. Any two dangerous goods may always be stowed directly above/below one another provided each is correctly placarded.

D. Segregation requirements apply only to break-bulk cargo, not to dangerous goods packed in closed containers.