Question: In the context of database normalization, what does the term candidate key refer to ? A key that uniquely identifies a tuple in a relation

In the context of database normalization, what does the term "candidate key" refer to?
A key that uniquely identifies a tuple in a relation
A key that is used to join multiple tables
A key that is determined by another key
A key that is a subset of the primary key
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In the context of database normalization, what

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