What is a foreign key?

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answerhappygod
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What is a foreign key?

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a) A foreign key is a primary key of a relation which is an attribute in another relation
b) A foreign key is a superkey of a relation which is an attribute in more than one other relations
c) A foreign key is an attribute of a relation that is a primary key of another relation
d) A foreign key is the primary key of a relation that does not occur anywhere else in the schema
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