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A prime attribute of a relation scheme R is an attribute that appears

1. in all candidate keys of R.
2. in some candidate key of R.
3. in a foreign key of R.
4. only in the primary key of R.

Correct answer: in some candidate key of R.

Solution

A prime attribute is defined as an attribute that is part of at least one candidate key, which means it plays a crucial role in uniquely identifying tuples within the relation.

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