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The _________ property for an index causes MongoDB to reject duplicate values for the indexed field.

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The _________ property for an index causes MongoDB to reject duplicate values for the indexed field.

(a) Hashed

(b) Unique

(c) Multikey

(d) None of the mentioned

I got this question during an interview.

I need to ask this question from Index Types topic in section Index/Indexing Concepts of MongoDB

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Best answer
The correct answer is (c) Multikey

The best I can explain: Other than the unique constraint, unique indexes are functionally interchangeable with other MongoDB indexes.

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