What does Annex 4 item 44 require of fire extinguishers on a passenger bus in Belarus?

1. At least one extinguisher of at least 2 litres, placed near the driver's workplace; a double-deck vehicle needs an additional one on the upper deck
2. At least two extinguishers of at least 1 litre each, one at each end of the saloon
3. Extinguishers are optional if automatic sprinklers are fitted
4. At least four extinguishers of any capacity