How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes?

Options

1. AThe torch uses hydrogen gas to directly melt metal surfaces during welding.
2. BThe torch uses methane gas to create a high-temperature flame for cutting and welding.
3. CThe torch generates atomic hydrogen through electrolysis and uses the huge energy released for cutting and wel
4. DThe torch relies on the combustion of hydrogen gas in the presence of oxygen for cutting and welding.