Under Alberta regulations, a rear-facing child safety seat must be used for infants until they reach what physical criteria?

1. A minimum weight of 5 kg (11 lbs) and age of 6 months
2. A minimum weight of 10 kg (22 lbs) and the ability to walk
3. A minimum weight of 10 kg (22 lbs), a minimum age of 1 year, and the ability to walk and sit upright
4. A minimum weight of 15 kg (33 lbs) and age of 2 years