Question: In a relational database, what does the primary key field enable users to do ? Differentiate one record from another Define the format of screens

In a relational database, what does the primary key field enable users to do?
Differentiate one record from another
Define the format of screens and forms
Implement data constraints
Combine data from different tables
Store information about table structures
In a relational database, what does the primary key field enable

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