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1. a) The DBA (DB Administrator) is ultimately responsible for every aspect of DBMS. Briefly identify & describe three responsibilities of a DBA. [9] b) The DBA's responsibilities are constantly changing. Briefly identify & describe two emerging characteristics or new technologies of DBs that may change the responsibilities of the DBA. 141 c) Discuss (with example) when the Selectivity of a Query may decide the suitability of a compatible index in executing the Query [6]