To Ensure Accuracy in Measurement of Blood Pressure with an Invasive

To ensure accuracy in measurement of blood pressure with an invasive monitoring catheter,what should the nurse do?

A) Balance and calibrate the monitoring equipment every hour.
B) Ensure that the patient is lying supine with the head of the bed flat.
C) Position the zero-reference stopcock line level with the phlebostatic axis.
D) Position the limb with the catheter insertion site at zero reference of the stopcock line.