The correct option is C Both A and B
Biogas is an alternate source of energy produced by the anaerobic digestion of biomass such as animal excreta and kitchen wastes. The biogas plant was first installed in 1941 at IARI. The distinctive features of the plant were a well type digester and a mild steel gasholder, which was balanced by a counterweight connected through ropes and supporting poles. The KVIC and the Planning Research and Action Division (PRAD), tried to promote the IARI design. Thus, the correct answer is option C.