Find the derivative of the function at Po in the direction of A. f(x,y,z) = xy + yz + zx, Po(1, -1,2), A=2i + 6j - 3k (DAD) (1, -1,2) = (Simplify your answer.)Is there a direction u in which the rate of change of f(x,y} = x2 - 3xy +4y2 at PH ,2) equals 14? Give reasons for your answer. Choose the correct answer below. 0 A. No. The given rate of change is smaller than the minimum rate of change. 0 B. No. The given rate of change is larger than the maximum rate of change. 0 C. Yes. The given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change