Please choose the correct ending to complete the given sentence: Health: [header] How to give a shot [title] Ensure a sterile work area. [step] Shots penetrate the body's most important defense against disease-the skin. Because of this, care must be taken to prevent the transmission of germs that cause infection.

Ending1: If you want to give your first shot, do it at a medical facility, hospital, or on a regular basis. [substeps] While possible to avoid infections with sterile substances, you should clean your equipment prior to injecting them into the body. Ending2: [substeps] If you are not sure how often a shot is needed, ask your physician or a secretarial assistant who administers. They should be able to determine a working area for you. Ending3: Before you try giving shots, make sure there is adequate ventilation. [substeps] Make sure there is enough room in your house to give your shot. Ending4: Begin by washing the area where you will set your materials with soap and water. Wash, dry, and disinfect your hands thoroughly.

Answer format: ending1/ending2/ending3/ending4