What is the requirement in Bosnia and Herzegovina regarding the use of vehicle headlights during daytime driving?

1. Low-beam headlights (kratka svjetla) or daytime running lights (dnevna svjetla) must be illuminated at all times on all roads
2. Headlights are only required during daytime when driving through fog or heavy rain
3. Headlights are only required outside built-up areas during daylight
4. Daytime headlights are optional during summer months