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When does the predicate is null succeed?

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When does the predicate is null succeed?

(a) If the value on which it is applied is finite

(b) If the value on which it is applied is invalid

(c) If the value on which it is applied is blank

(d) If the value on which it is applied is more than the allowed limit

I had been asked this question in semester exam.

My question is from Set Operations in division Introduction to Relational Model and Sql of RDBMS

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The correct choice is (c) If the value on which it is applied is blank

Explanation: The is null predicate succeeds when the value on which it is applied is blank/null.

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