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      Question

      What is a primary key in a relational database?

      A A key that uniquely identifies a record in a table Correct Answer Incorrect Answer
      B A key that allows duplicate values Correct Answer Incorrect Answer
      C A key used to sort data Correct Answer Incorrect Answer
      D A key referencing another table Correct Answer Incorrect Answer
      E A key that stores encrypted data Correct Answer Incorrect Answer

      Solution

      Primary keys ensure that each record is unique and cannot be NULL.

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