There are three investment options, Inv1, Inv2 and Inv3, available for you to invest in. However, there is a condition imposed on these options: . At least one out of the two investments, Inv1 or Inv2, should be invested in if you invest in Inv3. X1, X2 and X3 are binary variables which take the value of 1 if Inv1, Inv2 and Inv 3 are invested in respectively, and a value of 0 otherwise. Which of the following binary constraints implement the above condition: (single option correct) O X1 + X2 - X3 = 1 O X1 + X2 + X3 = 0