During an exam, Julie must take vital signs from an animal. Which of the following steps is the most correct procedure for her to take the rectal temperature?
1) Use a digital thermometer and insert it gently into the animal's rectum.
2) Use an oral thermometer and insert it gently into the animal's rectum.
3) Use a rectal thermometer and insert it gently into the animal's rectum.
4) Use an ear thermometer and insert it gently into the animal's rectum.