A depreciable asset has an estimated 10% salvage value. At the end of its estimated useful life, the accumulated depreciation would equal the original cost of the asset under which of the following depreciation methods? (1) Sum-of-the-years' -digits; (2) Productivity output O a (1) Yes; (2) Yes Ob (1) No: (2) Yes OC (1) No: (2) No Od (1) Yes (2) No