4. Given the system of linear equations C1 - 12 - 13 = 1 2x1 - 3x2 + 13 = 7 determine if a solution exists. If it does, what is the solution? A) Let t be a variable such that t goes from negative to positive infinity. The solution set is (4t - 3, 3t - 4, t). B) Let t be a variable such that t goes from 0 to positive infinity. The solution set is (4t - 3, 3t - 4, t). C) Let t be a variable such that t goes from negative to positive infinity. The solution set is (3t - 4, 4t - 3, t). D) Let t be a variable such that t goes from negative to positive infinity. The solution set is (t, 4t - 3, 3t - 4). E) None of the above