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Which of the following accepts named parameters?

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Which of the following accepts named parameters?

(a) $reduce

(b) $letnum

(c) $let

(d) None of the mentioned

I have been asked this question during an online exam.

Question is taken from Pipeline and Sharded Collections topic in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

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The correct answer is (d) None of the mentioned

Explanation: $let defines variables for use within the scope of a subexpression and returns the result of the subexpression.

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