Which of the following statements is true regarding child safety in vehicles?

All of the statements regarding child safety in vehicles are true.

Infant carriers must indeed be crash-tested to ensure they meet safety standards that protect children in the event of a collision. This testing process is crucial because it provides security and assurance that these carriers can withstand impact and keep infants safe.

Securing children in the rear seat is also a vital practice, as this area of the vehicle is typically safer during a crash. The rear seat minimizes the risk of injury from airbag deployment and is further away from the impact point in most collisions, providing an additional layer of protection for younger passengers.

Additionally, the law mandates that drivers secure children five years old or younger in an appropriate child safety seat. This requirement is in place to reduce the risk of injury or fatality in a crash, recognizing that younger children are particularly vulnerable due to their size and developmental stage.

Given that all these statements reflect recognized safety measures and legal requirements, the answer encompasses a comprehensive view of child safety in vehicles.