How should you restrain toddlers if they are at least 1 year old and weigh at least 20 lbs?

• In the forward-facing convertible car seat and it should be in the back seat of the vehicle
  Explanation:

  "Toddlers must use forward-facing convertible car seats until they are at least one year old and twenty pounds or reach the car seat manufacturer’s maximum recommended weight limit. The front-facing car seats must be in the back seat only."
• In the rear-facing convertible car seat and it should be in the back seat of the vehicle
• By the shoulder harness of seatbelt
• None of the above