According to the following graph, and without any calculation, what is the optimal solution if this is a maximization problem? X2 Constraint 1 Feasible Region (0, 0) 0 (X1, X2} = (4, 3) Q We can't tell 0 No solution 0 (X1, X2} = (6, 0) 0 (X1. X2} = (0, 0) 0 (X1, X2} = (0, S)