A firm has ptepared the following binary integet program to evaluate a number of potental locations for new warehouses. The firm's goal is to maximize the net present value of their dectsion whille not spending more than their currently wailable capital Max20x1+3ex2+10x3+15x4st5x1+7x2+12x3+12x421(Constraint1)x1+x2+x3+x422(Constraint2)x1+x21(Constraint3)x1+x3=1[Constiaint4)x2=x4[Constraint5]xj={1,iflocotionjinaelected0,otherwise Which of the constraints enforces a contingent relationship