Which of the following is a requirement for using a child safety seat?

Using a child safety seat involves specific guidelines to ensure the child's safety during transportation. The correct requirement emphasizes that the child must fit within the weight and height guidelines specified by the safety seat manufacturer. This is crucial because child safety seats are designed to provide maximum protection based on the child’s size, ensuring that the seat functions properly in the event of an accident.

If a child is either too heavy or too tall for the seat, the effectiveness of the safety seat diminishes significantly. Therefore, adhering to these guidelines is essential to provide the proper support and restraint needed to keep the child safe.

In contrast, other options may not accurately reflect the appropriate use of a child safety seat. The age requirement is not a sole indicator, as children may vary significantly in size and development. Seating in the front seat can pose hazards owing to airbag deployment and is generally discouraged for younger passengers. Lastly, the age of the safety seat is less important than the child's fit within the established guidelines, as seats must also comply with current safety standards.