The nurse in the hospital cafeteria sees a pregnant woman stand up and clutch her throat. The nurse asks the woman if she is choking, but the woman is unable to speak. The nurse moves behind the patient. What should the nurse do next? 1. Perform five back blows to the victim's lower back. 2. Perform five back blows to the victim's upper back. 3. Reach under the victim's arms and deliver firm thrts to the victim's chest. 4. Reach under the victim's arms and deliver firm thrts to the victim's abdomen.