3. (20pts) Consider a decision-making about the placement of mirror sites in a content distribution network (e.g., NetFlix video cache sites). See Figure 2 for illustration. The decision-making is a fuzzy process, due to the following unclear trade-offs: i) Faster content access by clients vis-a-vis higher overhead of updating mirror sites; ii) Higher monetary cost involved in deploying a large number of mirror sites; iii) Security risks from adversaries due to wider exposure of content with higher replication; iv) Increased software complexity of running push/pull algorithm on many mirror sites. Discuss the above trade-offs (i)-(iv) in a semi-quantitative manner. You can use, for instance, different client-level content demand rates, content-update rates (e.g., frequency of news postings), economic aspects of leasing machines from data-centers, network bandwidth allocation costs, and customer dissatisfaction due to content download delays. Figure 2: Illustration of a content-delivery network infrastructure (e.g., NetFlix, YouTube)