Question: One of the documents in your collection has an \_id based upon an older database design and you want to change it. You write an update command to find the document and replace the \_id but the \_id isn't changed. How should you fix the issue?

1. Set the replace option to true.
2. Use the replaceOne() command instead.
3. You can't. Once set, the \_id field cannot be changed.
4. Use the updateOne() command instead.

Answer: The correct answer of the above question is Option C:You can't. Once set, the \_id field cannot be changed.