The Nurse Is Caring for a Patient with a Central

The nurse is caring for a patient with a central venous catheter used for intermittent medication administration.When flushing the catheter prior to administering the next dose of medication,which initial action by the nurse is the most appropriate?

A) Aspirating the patient's catheter for blood
B) Positioning the patient in reverse Trendelenburg position
C) Flushing the catheter,using as much force as required in order to clear the line
D) Obtaining a 3 mL syringe and filling it with normal saline for flushing the line