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What does the notnull integrity constraint do?

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What does the notnull integrity constraint do?

(a) It ensures that at least one tuple is present in the relation

(b) It ensures that at least one foreign key is present in the relation

(c) It ensures that all tuples have a finite value on a specified attribute

(d) It ensures that all tuples have finite attributes on all the relations

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I need to ask this question from SQL Data definition topic in division Introduction to Relational Model and Sql of RDBMS

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Right answer is (c) It ensures that all tuples have a finite value on a specified attribute

Explanation: The notnull integrity constraint ensures that all the tuples have a finite value on the specified attribute in the relation. It avoids the specification of null values.

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