The ______ field is always the first field in the document.
(a) _id
(b) id
(c) Ob_id
(d) None of the mentioned
(a) _id
(b) id
(c) Ob_id
(d) None of the mentioned
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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.