Solve the linear programming problem What is the maximum value of z? Select the correct choice below and, if necessary, fill in the Maximize z =15x + 15y answer box to complete your choice. subject to 8x + 6y 2 128 14x - 10y 2 60 xtys 42 O A. 2= X20 (Type an integer or a fraction.) y20 O B. There is no maximum value of z. At what corner point(s) does the maximum value of z occur? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The maximum value of z occurs only at the point(s) (Type an ordered pair. Use a comma to separate answers as needed.) B. The maximum value of z occurs at the points and at all points connecting them. (Type an ordered pair. Use a comma to separate answers as needed.) OC. There is no maximum value of z