Consider the HITS algorithm Assume that there are four web sites A, B, C, and D. The interconnection among them are shown as follows: (a) [3 mark] What are the normalized authority weight and the normalized hub weight for each site in the first three iterations? (b) ID markl Let the final ranking score of a site be the sum of its authority weight and its hub weight (using the weight vector computed after three iterations in Q1(a)). Please rank the sites in descending order of the ranking scores. (If there are ties, please rank them alphabetically)