In the event of severe arterial bleeding (hemorragia arterial) from a limb on board a sports boat, what is the primary first-aid action?

1. Apply firm, direct pressure over the wound with a sterile dressing or clean cloth, maintaining continuous pressure
2. Wash the wound with gasoline to disinfect it
3. Immerse the bleeding limb in cold seawater
4. Administer multiple aspirins to thin the blood