which of the following statements is correct? a. using macrs depreciation rather than straight line would normally affect the timing of the cash flows and thus the npv. b. firms must use straight-line depreciation for all assets whose lives are 5 years or longer. c. since depreciation is not a cash expense, it has no effect on cash flows and thus no effect on capital budgeting decisions. d. under macrs depreciation rules, higher depreciation charges occur in the early years, and this reduces the early cash flows and thus lowers a project's projected npv.