Determine the Values of X and Y That Produce the Maximum

Multiple Choice

Determine the values of x and y that produce the maximum value of the objective function on the given feasible region.
-Maximize $z = 40 x + 50 y$

A) $x = 10 , y = 4$
B) $x = 0 , y = 8$
C) $x = 10 , y = 0$
D) $x = 6 , y = 8$