Question 1 1 pts Suppose that z is defined implicitly as a function of a and y by the equation F(x, y, z) = 0 where F is differentiable. Suppose that F(xo, yo, Zo ) = 0 and Fz (x0, yo, Zo ) = 0. What can we conclude about (Oz/Ox) (x0, yo )? O (a) It is undefined. O (b) It might or might not be defined. O (c) It is defined, but it cannot be calculated by implicit partial differentiation