This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to treat a skin flap or abrasion during first aid
Wash your hands.
Before you take action to address an abrasion or a skin flap, you need to ensure that you are lowering any potential risk of infection. The abrasion itself is unlikely to be serious, but if it becomes infected you could become very ill.

Possible answers: 1. Unless you have both hands, wash the affected area or any other surfaces you touched with soap and water. Then dry off with a clean, dry towel.; 2. If possible, wash your hands before taking action to prevent spreading bacteria to other surfaces. This is especially important for those pulling the flaps out of the depth of the wound.; 3. Get in the habit of using a hand soap formulated for skin-flap wounds. Go over your hands thoroughly with the soap, then place it on your bandage if necessary to cover it up.; 4. Thoroughly wash your hands with soap and water, before you turn your attention to the wound. If you have access sterile latex gloves you can wear these as well.;
The answer is:
4.