Answer:
c. the total amount to be charged (debited) to expense over an asset's useful life.
Step-by-step explanation:
The depreciable base is the value which is to be recognized after considering the purchase cost or acquired cost minus salvage value divided it by useful life
In mathematically,
Depreciation base = (Purchase cost - salvage value) ÷ Useful life
So it is the total amount i.e to charged over the asset useful life and it would also be debited while recording the depreciation