Children under age 4 must be in a safety seat. What about children ages 4 and 5?

• They must be either in a safety seat or a booster seat
  Explanation:

  "Children under age 4 must be in a safety seat, and children ages 4 and 5 must be in either a safety seat or a booster seat."
• They can be restrained using a seat belt
• They should be seated in the front seat with an active passenger side airbag
• None of the above