MongoDB C100DBA Exam - Topic 8 Question 121 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 121
Topic #: 8

What does the following aggregate query perform?

AFetches the posts with likes between 100 and 200 and sets their _id as null

BGroups the posts by number of likes (101, 102, 103.) by adding 1 every time

CCalculates the number of posts with likes between 100 and 200

DFetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time

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Suggested Answer: C

by diana loaiza at Nov 24, 2025, 11:08 AM

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