A nurse is teaching a new parent how to correctly use a car seat. Which of the following statements by the parent indicates an understanding of the teaching?

"I should keep my baby in a rear-facing car seat until they are 2 years old.”.

"I should strap my baby in the seat with a four-point harness.”.

"I should place the shoulder harness in the slots above my baby's shoulders.”.

"I should position my baby's car seat at a 30-degree angle.”.