Name five hazard classes that require placarding in any amount.

a) Explosives, Gases, Flammable Liquids, Toxic Substances, Corrosives
b) Radioactive Materials, Poisonous Gases, Infectious Substances, Organic Peroxides, Miscellaneous Dangerous Goods
c) Flammable Solids, Oxidizers, Compressed Gases, Aerosols, Self-reactive Substances
d) Inhalation Hazards, Combustible Liquids, Combustible Solids, Water-reactive Substances, Elevated Temperature Materials