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

A. 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.

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

A. 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.

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

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

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.