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$sum is an accumulator operator available only in the _______ stage.

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$sum is an accumulator operator available only in the _______ stage.

(a) $group

(b) $sets

(c) $accumulator

(d) None of the mentioned

I got this question in homework.

The above asked question is from Pipeline Operators topic in section Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
Correct option is (a) $group

For explanation: $sum calculates and returns the sum of all the numeric values.

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