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__________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.

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__________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.

(a) Computer

(b) Monitors

(c) Accumulators

(d) Performoner

I have been asked this question in quiz.

Enquiry is from Pipeline Operators in chapter Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
Right choice is (c) Accumulators

To explain: Accumulators are available only for the $group stage.

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