Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point. .3 3 f(x.y) =x +y- 192x - 108y- 4 O A. f(-8,- 6)= 1452, local maximum O B. f(8, - 6) = - 596, saddle point; f(-8,6) = 588, saddle point O C. f(8,6) = - 1460, local minimum; f(8, - 6) = - 596, saddle point; f(- 8,6) = 588, saddle point; f(-8, - 6) = 1452, local maximum O D. f(-8,-6) = 1452, local maximum; f(8,6) = - 1460, local minimum