Assume a project has normal cash flows, with one outflow at the beginning of the project, followed by a series of inflows. Holding all else equal, which of the following statements is CORRECT? Select one: a. A project's regular payback increases as the WACC declines. b. A project's IRR increases as the WACC declines. c. A project's NPV increases as the WACC declines. d. A project's MIRR is unaffected by changes in the WACC.