Which of the following statements is FALSE?

		a. When using the incremental IRR rule, you must keep track of which project is the incremental project and ensure that the incremental cash flows are initially positive and then become negative.
		b. When the risks of two projects are different, only the NPV rule will give a reliable answer.
		c. Problems arise using the IRR method when the mutually exclusive investments have differences in scale.
		d. Picking one project over another simply because it has a larger IRR can lead to mistakes.