Concept:Net Present Value (NPV) is the difference between the present value of cash inflows and the present value of cash outflows.Explanation:NPV is calculated as: NPV=Present value of cash inflows−Present value of cash outflows Option A states: Present value of net cash inflow - Total net investment (which is a specific case where total net investment is the present value of outflows at time 0). Option B states: Present value of net cash inflow - Present value of cash outflow (the general formula). Both A and B are correct interpretations of NPV.Answer:Option D: a or b.