A depreciable asset has an estimated 15% salvage value. At the end of its estimated useful life, the accumulated depreciation will equal the original cost of the asset under which of the following depreciation methods?
a. Straight-line and Units-of-Output
b. Straight-line, but not Units-of-Output
c. Units-of-Output, but not Straight-line
d. Neither Straight-line nor Units-of-Output