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KPGCET-CSE-2019-1

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The relational DBMS is constructed on relational principles which are based on 

  1. The matrix theory 
  2. Axiomatic principles 
  3. Primary key 
  4. Primary & foreign key relationship
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primary key and foreign key relationship maintains the relations among the various TABLES of the RDBMS.

Hence the option D is correct.
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