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Comparison expressions return a boolean except for ________ which returns a number.

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Comparison expressions return a boolean except for ________ which returns a number.

(a) $copy

(b) $cmp

(c) $num

(d) None of the mentioned

I had been asked this question in an internship interview.

Question is from Pipeline Limits in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
Right choice is (b) $cmp

The best I can explain: The $cmp compares both value and type, using the specified BSON comparison order for values of different types.

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