Which of the following statements is correct? (a) The NPV method assumes that cash flows will be reinvested at the required rate of return while the IRR method assumes reinvestment at the IRR. (b) The NPV method does not consider the inflation premium. (c) The NPV method assumes that cash flows will be invested at the risk-free rate while the IRR method assumes reinvestment at the IRR. (d) The IRR method does not consider all relevant cash flows.