7- For a function f(x, y), suppose that fzz = x² and D(x, y) = fzzfyv – fzy %3D x*y? – 2. Which is true for the points P(1,1) and Q(1, 2) where P and Q are critical points of f. a) None of the above b) P is a local min and Q is a local max. P is a local max and Q is a local min. d) P is a saddle point and Q is a local max. P is a saddle point and 0 is a local min.

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