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Answer : C

In  RDBMS, No Two Tuples can have All the Attribute Values same. These are some Basic Codd's Rules. Codd Proposed RDBMS model, It is called Relational Model because Every Table is a Relation (Subset of Cross Product of Attributes' Domains) in Which elements are Tuples of tables. Since RDBMS model is derived from Set Theory, No Two tuples can be Exactly same. 

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