The correct option is
C Both A and B
Leachate generation is a major problem for municipal solid waste (MSW) landfills and causes significant threat to surface water and groundwater. There are many methods of leachate treatment such as:
Aerobic Biological Treatment such as aerated lagoons and activated sludge.
Anaerobic Biological Treatment such as anaerobic lagoons, reactors.
Physiochemical treatement such as air stripping, pH adjustment, chemical precipitation, oxidation, and reduction.
Coagulation using lime, alum, ferric chloride, and land treatment.
Advanced techniques such as carbon adsorption, ion exchange.