Which one of the following statements regarding the investment decision criteria is correct? Select one: a. A profitability index that is less than 1.0 indicates that a project is acceptable. b. If the accounting rate of return exceeds the required discount rate, the project should be accepted. c. When a project's discounted payback period is shorter than its payback period, it should be accepted. d. When the discount rate is greater than the internal rate of return, the project should be accepted. e. A project is still considered acceptable if its net present value is equal to zero. This is because the project is earning the required return when NPV is 0