1. Cohesive subgroup a. Considering the social network in the following figure, identify the 2-clans and 2-clubs. b. Considering the social network in the following figure, identify the 2-plexes. c. How is the cohesiveness of the 2-clans different from that of the 2-plexes? If the tie is the co-authorship relationship between two authors in the social network in the following figure, which cohesive subgroup measure would you pick?