The graph below shows the value, `V_n`, of an asset as it depreciates over a period of five months.
Which one of the following depreciation situations does this graph best represent?
- flat rate depreciation with a decrease in depreciation rate after two months
- flat rate depreciation with an increase in depreciation rate after two months
- unit cost depreciation with a decrease in units used per month after two months
- reducing balance depreciation with an increase in the rate of depreciation after two months
- reducing balance depreciation with a decrease in the rate of depreciation after two months