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2. a) Briefly compare & contrast two characteristics of a Document Store in place of a Relational DB. [6] b) Typically, a distributed Document Store supports CAP (Consistency, Availability & Partition Tolerance). What is the most noteworthy issue of CAP and why might a compromise be necessary? [6] c) What are the two mechanisms that MongoDB may employ when modelling one-to-many relationships? [4] d) Discuss two reasons why MongoDB employs BSON (Binary JSON) for its storage & networking, in place of JSON. (4)