Which of the following statements is true regarding the NPV and IRR methods? Select all that apply. I. The NPV method adjusts for the risk of an investment and is therefore superior to the IRR method. II. The NPV method is adjusted for the scale of an investment and is therefore superior to the IRR method. III. The IRR method adjusts for the risk of an investment and is therefore superior to the NPV method. IV. The NPV method adjusts for the timing of cash flows and is therefore superior to the IRR method. V. The IRR method is adjusted for the scale of an investment and is therefore superior to the NPV method. VI. The IRR method adjusts for the timing of cash flows and is therefore superior to the NPV method