Final answer:
A child under 8 years old and shorter than 4 feet 9 inches must sit in the rear seat, or in the front seat if there is no rear seat.
Step-by-step explanation:
The seating requirement for a child under the age of 8 and less than 4 feet 9 inches tall, according to the information provided, is as follows: The child must be seated in the rear seat of a vehicle. If there is no rear seat available, then the child can be seated in the front seat. Therefore, the correct answer to the seating requirement for a child under these conditions would be: 1) Seated in the rear seat, or if there's no rear seat available, 4) Seated in the front seat if no rear seat is present.