The following statements S1 and S2 pertain to two procedures for disposal of Municipal solid Waste.

S1: Gasification is the conversion of waste and biomass into liquid and gaseous fuel as well as solid residues and char at 500°C-1000°C in absence of air.

S2: Pyrolysis is a partial combusion of organic or fossil based carbonaceous material, plastics, etc. into carbon monoxide, hydrogen, carbon dioxide, and methane, at a temperature of 650°C, with controlled amount of air/oxygen.

Identify the correct answer.