Choose the correct statement regarding superkeys

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answerhappygod
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Choose the correct statement regarding superkeys

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a) A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple
b) A superkey is a tuple or a set of multiple tuples that can uniquely identify an attribute
c) Every superkey is a candidate key
d) A superkey is an attribute or a set of attributes that distinguish the relation from other relations
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