Ex.2 Consider ƒ € C²(R²) and Po a stationary point for f. Let H,(Po) = (27¹1) be the Hessian matrix of f at the point P, with h E R, then Po is: (A) a relative minimum point for h < 2 (B) a saddle point for h <1 (C) a relative maximum point for h <1 (D) a relative minimum point for h<1

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