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The predicate in a where clause can involve Boolean operations such as and. The result of true and unknown is_______ false and unknown is _____ while unknown and unknown is _____

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The predicate in a where clause can involve Boolean operations such as and. The result of true and unknown is_______ false and unknown is _____ while unknown and unknown is _____

(a) Unknown, unknown, false

(b) True, false, unknown

(c) True, unknown, unknown

(d) Unknown, false, unknown

I have been asked this question in an online quiz.

This intriguing question comes from Null Values Operations topic in section SQL : Queries, Constraints and Triggers of Database Management

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Correct choice is (d) Unknown, false, unknown

The best explanation: None.

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