Question

________ passes the first n documents unmodified to the pipeline where n is the specified limit.

(a) $skip

(b) $limit

(c) $match

(d) $redact

This question was addressed to me in exam.

This intriguing question originated from Aggregation Operations topic in section Aggregation Concepts and Aggregation Mechanics of MongoDB

Answer 1

The correct choice is (b) $limit

The best I can explain: For each input document, outputs either one document (for the first n documents) or zero documents (after the first n documents).