Solve the system of equations. x-3y z = -9 -x+8y-4z = 24 2x-15y+7z = -45 Select the correct choice below and fill in any answer boxes within your choice. OA. There is one solution. The solution is (0. (Type exact answers in simplified form.) OB. There are infinitely many solutions. The solutions are (z), where z is any real number. (Type exact answers in simplified form.) OC. There is no solution. C