Given the function f(x,y)=x³-5x² + 4xy-y2-16x - 10.
Which ONE of the following statements is TRUE?
A. (-2,-4) is a maximum point of f and ( 8/3 , 16/3) is a saddled point of f.
B. None of the choices in this list.
C. (-2,-4) is a minimum point of f and (8/3, 16/3) is a maximum point of f.
D. Both (-2.-4) and (8/3, 16/3) are saddle points of f.