What does the output x of the following MongoDB aggregation query result into; db.

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What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; " $author " , x: { $sum: $likes } } } ] )

Average of likes on all the posts of an author, grouped by author

Number of posts by an author

Sum of likes on all the posts by all the authors

Sum of likes on all the posts by an author, grouped by author

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What does the output x of the following MongoDB aggregation query result into; db.

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