A nurse is preparing to administer enoxaparin to a patient for deep vein thrombosis (DVT) prophylaxis. The nurse is using a prefilled syringe with enoxaparin. Which action by the nurse indicates a need for further teaching?

The nurse massages the area after administration to ensure absorption.

The nurse administers the medication at a 90-degree angle.

The nurse injects the medication at least 2 inches from the umbilicus.

The nurse rotates the site of the injection each administration.