(Choose 1 answer)
What is a primary key?
A. A primary key is the field(s) in a table that uniquely defines the row in the table
B. A primary key is the field(s) in a table that is used to establishes a relationship between two tables
C. A primary key is the field(s) in a table that uniquely defines that table in a database
D. A primary key is the field(s) in a table that is used to establishes a relationship between two databases
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