Which of the following statements is CORRECT? Select one: a. One drawback of the payback method is that this method does not consider cash flows that occur beyond the payback period. b. If a project's payback is a positive number, then the project should be accepted because it must have a positive NPV. c. The regular payback ignores cash flows beyond the payback period, but the discounted payback method overcomes this problem. d. The shorter a project's payback period, the less desirable the project is normally considered to be by this criterion.