Final answer:
The extreme values of the function f(x, y) subject to the constraints g1(x, y) = 17 and g2(x, y) = 20 occur at the intersection points of the constraint curves.
Step-by-step explanation:
The extreme values of the function f(x, y) subject to the constraints g1(x, y) = 17 and g2(x, y) = 20 can be found at the intersection points of the constraint curves. This means that the extreme values occur when g1(x, y) = 17 and g2(x, y) = 20 simultaneously. So, the correct answer is option D) The extreme values occur at the intersection points of the constraint curves.