A point on a complex curve of a two-variable unconstrained function where two partial derivatives are zero is a local maximum if
A) the second partial derivatives and mixed partial derivative are zero
B) the second partial derivative is negative
C) the second partial derivatives are negative, and the mixed partial derivative is positive
D) the second and mixed partial derivatives are positive

Question

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The Answer of A point on a complex curve of a two-variable unconstrained function where two partial derivatives are zero is a local maximum if
A) the second partial derivatives and mixed partial derivative are zero
B) the second partial derivative is negative
C) the second partial derivatives are negative, and the mixed partial derivative is positive
D) the second and mixed partial derivatives are positive

A Point on a Complex Curve of a Two-Variable Unconstrained