12. (3 points) Use the contour diagram of f in Figure below to decide if the specified directional derivative is positive, negative, or approximately zero. 3 N L - 2 -3 -2 -1 2 3 (a) At the point (-2, 2), in direction i. (b) At the point (0, -2), in direction J. (c) At the point (-1, 1), in direction i + j. (d) At the point (-1, 1), in direction -7 + 3. (e) At the point (0, -2), in direction i - 2j