S. 11 : Property held for charitable purpose-Anonymous donations-The donations given by the donors whose addresses were not furnished to Assessing Officer, would fall within the ambit of section 115BBC and the donations given by donors whose addresses were duly furnished to the Assessing Officer, would be eligible for exemption under section 11(1)(d).[S. 2(24)(iia),11(1)(d), 115BBC,131, 133(6)]