19. The internal rate of return (IRR) rule can be best stated as: A) An investment is acceptable if its IRR is exactly equal to its net present value (NPV). B) An investment is acceptable if its IRR is exactly equal to zero. C) An investment is acceptable if its IRR is less than the required return, else it should be rejected. D) An investment is acceptable if its IRR is higher than the required return by 2 percentage points, else it should be rejected. E) None of the above