If a project has a positive net present value, then which of the following statements are correct? I. The present value of all cash inflows must equal the costs of the project. The IRR is equal to the required rate of return. II. A increase in the project's initial cost will cause the project to have a higher positive NPV. III. Any delay in receiving the projected cash inflows will cause the project to have a higher positive NPV. IV. IRR must equal zero