3. Given the decision table for determining the best supplier as follows: Suppliers Criteria Weight Supplier 1 Supplier 2 Supplier 3 Supplier 4 Score Score Score Score Quality 0.45 0.563 0.087 0.053 0.297 Price 0.25 0.303 0.078 0.573 0.046 Service 0.14 0.050 0.140 0.214 0.597 Delivery 0.16 0.638 0.060 0.151 0.151 a. How do you rank the suppliers based on the given criteria? Who's the best supplier? b. If you are using AHP to solve the problem, how do you structure the problem? Draw the decision hierarchy. c. Based on the decision hierarchy in (b), how many pairwise comparisons you need to perform