What is the rule for transporting children under 12 years of age and under 150 cm in height in passenger cars in Belarus?

1. They may sit on an adult's lap using a single shared seatbelt
2. They must be transported using child restraint systems (child seats/boosters) appropriate for their weight and height
3. They may sit in the front passenger seat using standard vehicle seatbelts alone
4. Child seats are optional if traveling within city limits