A Child in the Pediatric Intensive Care Unit Has a Pulse

A child in the pediatric intensive care unit has a pulse oximeter for continuous oxygen saturation readings.Which action by the nurse is important for this patient's safety?

A) Calibrate and "zero" the oximeter once per shift.
B) Ensure the machine stays plugged in at all times.
C) Have maintenance inspect the machine before use.
D) Move the oximeter probe to a new site each day.