A nurse is reinforcing teaching about car seat safety with a parent of a newborn. Which of the following statements by the parent indicates an understanding of the teaching?

"I should keep my baby rear-facing in the car seat until she is 2 years old."

"I should position the car seat's retainer clip at the level of my baby's belly button."

"I should enable the airbag when my baby is in the front seat of the car."

"I should place my baby in the car seat at a 90-degree angle."