(1 point) Use the contour diagram of f to decide if the specified directional derivative is positive, negative, or approximately zero. Positive Negative (-i+j)/√2. 1. At the point (1, 0) in the direction of -3. -- 2. At the point (-1, 1) in the direction of 24- Zero ▼ 3. At the point (0, 2) in the direction of j Positive (-i –j)/√2. 4. At the point (-1, 1) in the direction of Negative 5. At the point (0,-2) in the direction of (i-21)/√5, Zero 6. At the point (-2, 2) in the direction of i, 16 10 아 12.0 10.0 60 12.0 10.0 120 (Click graph to enlarge)