Creating and Manipulating Documents Quiz

Hi,
For quiz " Insert Order" how below option is correct as array is never closed?

db.pets.insert([{ "_id": 1, "pet": "cat" },
                { "_id": 2, "pet": "dog" },
                { "_id": 3, "pet": "fish" },
                { "_id": 3, "pet": "snake" })

This is simply a typo in the explication of the answer. The array is closed correctly in the question.

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