Elance Exams Answers PDF file

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What's the difference between `save()` and `insert()` in mongo shell?

None of above is correct.
save() updates the document if if already exists (judges by if they already contains `_id`); inserts if it's new.
No difference between them.
save() updates the document if if already exists (judges by comparing them byte by byte); inserts if it's new.
save() updates the document if if already exists (judges by their indexed keys); inserts if it's new.
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