The correct answer is D. None of these.
Under the straight-line method, the asset is depreciated evenly over its useful life. Under the diminishing balance method, the asset is depreciated at a higher rate in the early years of its life and a lower rate in the later years. Under the depreciation fund method, a fund is set up to accumulate money to replace the asset at the end of its useful life.
In all of these methods, the asset is not shown at original cost throughout its life. The asset is shown at its depreciated value, which is the original cost of the asset less the accumulated depreciation.