Explanation:For related projection functionality in the aggregation framework pipeline, use the $project pipeline stage. 9. To suppress the _id field from the result set, specify _________ in the projection document.
A. _id: 1
B. _id: 0
C. _id: it
D. None of the mentioned
Answer:A
Explanation:For related projection functionality in the aggregation framework pipeline, use the $project pipeline stage. 9. To suppress the _id field from the result set, specify _________ in the projection document.
A. _id: 1 B. _id: 0 C. _id: it D. None of the mentioned