Consider a feasible region which consists of a square with the four corners at (0, 0), (1, 0), (1, 1) and (0, 1). Every point on the boundary of the square or inside the square is feasible.Which of the following statements is most likely true?

Group of answer choices

a. X2 <= - 1 (= negative 1) is a constraint.

b. X1 <= 0 is a constraint.

c. I can't choose an option unless an objective function is equal to 5X1.

d. X1 <= 1 is most likely a constraint of the feasible region.