Problem 3: Wolf-Fin is considering investing in four projects. Each requires a cash flow at time zero and Project yield a net present value (NPV) in millions, as shown in the table. If $15 million is available for investment at time 0, find the investment plan that maximizes the NPV using three methods: 1) explicit enumeration; 2) the Benefit/Cost Ratio, 3) the Branch and Bound. Cash OutflowNPV (S) at time o (S) (S) 10 16 10 4 2 4 1A