Then Nurse Is Using a Pulse Oximeter for Recording Oxygen

Then nurse is using a pulse oximeter for recording oxygen saturation. Which nursing consideration is most important for the nurse to keep in mind?

A) Avoid using alcohol to clean the site where the sensor is applied.
B) Ensure that the sensor is placed over the client's thumb or toe.
C) Ensure that the alarm is set when performing continuous analysis.
D) Avoid moving or changing the position of the sensor.