A linear program in two variables X1, X2 has the following constraints: X1 >=0. X2 >= 0 and the third constraint says that X1 = X2.The objective is to maximize 73X2.Which of the following statements is true?

A) The optimal solution value is finite.

B) There are multiple optimal solutions.

C) The optimal objective value is unbounded.

D) The optimal solution is (0, 0).