What is the proper first-aid protocol for an adult casualty who is unconscious, not breathing, and has no pulse?

1. Place the person in a sitting position and give them water
2. Immediately begin chest compressions and rescue breaths at a ratio of 30 compressions to 2 breaths (30:2) and call emergency services (103)
3. Wait 10 minutes to see if breathing resumes spontaneously
4. Perform rescue breaths only without chest compressions