Computer Science

Assertion. There can be multiple options for choosing a primary key in a data table.

Reason. All attribute combinations inside a data table that contain unique values for each row, are the candidate keys.

Relational Database

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Answer

(a)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Explanation
There can be more than one attribute in a relation possessing the unique identification property. All attribute combinations inside a relation that can serve as a primary key are candidate keys, as they are candidates for the primary key position.

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