A nurse is providing discharge teaching to a new guardian about car seat safety. Which of the following statements by the guardian indicates an understanding of the teaching?

A. The car seat should remain rear-facing until at least age 2, or until the child reaches the maximum height and weight limit specified by the manufacturer, not just until 12 months. B. The retainer (chest) clip should be positioned at the level of the infant's armpits, not the abdomen, to ensure proper restraint. C. Positioning the car seat at a 45° angle helps keep the infant’s airway open and reduces the risk of aspiration or airway obstruction. D. For rear-facing seats, the harness straps should be at or below the baby's shoulders, not above.