The function f has continuous second derivatives, and a critical point at (6, -9). Suppose fzz (6,-9) = -16, fzy(6, -9) = -8, f (6,-9) = -4. Then the point (6, -9): OA. cannot be determined OB. is a saddle point OC. is a local maximum OD. is a local minimum OE. None of the above

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