4.2.59 10 of 12 (12 complete) Solve using augmented matrix methods. 3x1 X2 11 x1 + 4x2 21 Select the correct choice below and, if necessary, il in tht answer box to complete your choice O A. The unique solution is x1åand x2 (Simplify your answers) andyt The system has infinitely many solutions (Simplify your answer. Type an expression using t as the variable) . The solution is-I B. ° C. There is no solution.