How should dangerous-goods packages be stored while waiting for loading or after unloading?

1. In a secure, ventilated place, protected from weather and heat, segregated from incompatibles and from foodstuffs, and never left as an unattended leak source
2. In direct sun on a public pavement with children nearby
3. In a locked private car boot mixed with groceries
4. Stacked against a heater to keep drums “dry” even if they are Class 5.2