1.5- 0.8 0.2 -0.4 y 0.4 -0.2 0.6 04 0.5- -0.6 0.5 1.5 Exercise 2 Once again, consider the above contour diagram. a) Estimate the direction of Vf (1,1). b) Estimate the magnitude |IVf (1,1) ||. c) What does your answer to part b) mean? That is, what does the number measure? d) Which is bigger: IIVf (1,1.5) || or |IVf (1,1)||? Explain