Let f (x, y ) be a function and fyx = 2xy, D (x, y) = fxx fyy - fxy fxy = x2 - 3y. Then what is true for the critical points P (2,1 ) and Q(1, - 4 )? O a. P is a saddle point, Q is a local maximum. O b. P is a local maximum, Q is a local minimum. OC. Pis a local minimum, Q is a saddle point. O d.P is local minimum, Q is a local maximum.

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