Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. A. This system has exactly one solution. The solution is left parenthesis nothing comma nothing comma nothing right parenthesis . (Type an exact answer in simplified form.) B. This system has infinitely many solutions of the form left parenthesis nothing comma nothing comma z right parenthesis , where z is any real number. (Type expressions using z as the variable.) C. This system has no solution