For which classes of dangerous goods is a 'drain seal', a 'shovel', and a 'plastic collecting container' mandatory equipment in the vehicle's safety kit?

1. Only for Class 2 gases
2. For solids and liquids of Classes 3, 4.1, 4.3, 8, and 9
3. Only for Class 6.2 infectious substances
4. For all loads, including dry goods under the small load exemption