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In a relational database, what is a foreign key? a ) A key that uniquely identifies a record within its table b ) A key

In a relational database, what is a foreign key?
a
)
A key that uniquely identifies a record within its table
b
)
A key that is used to speed up searches
c
)
A key used to link two tables together
d
)
A key that can accept null values
\

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