Solve using augmented matrix methods. - X1 + 4X2= 8 - 3x + 12x2 = 24 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The unique solution is X1 = and X2 (Simplify your answer.) The system has infinitely many solutions. The solution is X4 and X2 = t. B. (Simplify your answer. Type an expression using t as the variable.) O C. There is no solution