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Extracted text: In which of the wave energy conversion system, hydraulic arms are not required O a. Overtopping device O b. Attenuator O c. None of the options are correct O d. Point absorber A mixture of stone, soil, ceramics and glass obtained from as a waste material which can be used as a building material. O a. Direct combustion process O b. Anaerobic digestion process O c. Pyrolysis process O d. Fermentation process