The Nurse Has a Patient with a Tunneled Central Line

The nurse has a patient with a tunneled central line with a triple-lumen catheter.The insertion site is covered by an occlusive dressing with yesterday's date.The nurse is to give an IV drug through the central line.The nurse would initially:

A) Use any of the three ports for delivery.
B) Change the occlusive dressing.
C) Affirm catheter placement by withdrawing 3 ml of blood.
D) Check dilution of the drug.