Suppose that the directional derivative of a function f at a point P in the direction of the vector u = (-1,0) is -. Relate this 4 value to the behaviour of f. A. From the point P, the function f is increasing at a rate of in the positive x-direction. B. From the point P, the function f is increasing at a rate of - in the positive y-direction. C. From the point P, the function f is decreasing at a rate of in the negative y-direction.

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