What Technique Should the Nurse Use to Accurately Assess a Rectal

What technique should the nurse use to accurately assess a rectal temperature in an adult?

A) Use a lubricated blunt tip thermometer.
B) Insert the thermometer 2 to 3 inches into the rectum.
C) Leave the thermometer in place up to 8 minutes if the patient is febrile.
D) Wait 2 to 3 minutes if the patient has recently smoked a cigarette.