Give all solutions of the nonlinear system of equations, including those with nonreal complex components. x -y=0 2x+y = 8 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The solution set is (Type an ordered pair. Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Express complex numbers in terms of i. Use a comma to separate answers as needed.) O B. There are infinitely many solutions. O C. The solution is the empty set