What is a primary key?
a. A primary key is the field(s) in a table that uniquely defines that table in a database
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 the row in the table
d. A primary key is the field(s) in a table that is used to establishes a relationship between two databases
Answer: C