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The ______ field is always the first field in the document.

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The ______ field is always the first field in the document.

(a) _id

(b) id

(c) Ob_id

(d) None of the mentioned

I got this question in an online quiz.

This question is from ObjectId topic in division GridFS, BSON Datatype and Administration Concepts of MongoDB

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Right option is (a) _id

For explanation: Updates that include renaming of field names may result in the reordering of fields in the document.

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