Which of the following statements is CORRECT?

If a project has $$normal$$ cash flows, then its MIRR must be positive

The definition of $$normal$$ cash flows is that the cash flow stream has one or more negative cash flows followed by a stream of positive cash flows and then one negative cash flow at the end of the project$$s life

If a project has $$normal$$ cash flows, then it can have only one real IRR, whereas a project with "nonnormal" cash flows might have more than one real IRR

If a project has $$normal$$ cash flows, then its IRR must be positive