Let f(x,y) be a function which has a critical point at (1,-2) with continuous partial derivatives. Which of the following properties is enough to conclude that (1,-2) is a saddle point? I. fxx (1,-2) < 0 and fyy (1,-2 ) < 0. II. fxy (1,-2) < 0. III. fxx (1,-2) fyy (1,-2) < fxy (1,-2) fyx (1,-2). IV. fxx (1,-2) fyy (1,-2)=fxy (1,-2) fyx (1,-2) a. I b. III c. II d. IV

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