Question: You want to write a query that will compute the average number of reviews for all Airbnb listings in this database. Which of the following

You want to write a query that will compute the average number of reviews for all Airbnb listings in this database. Which of the following is a correct query?

$group: { _id: "$room_type", avgreviews: { $avg: "$number_of_reviews"}}

$group: { _id: null, avgreviews: { $avg: "$number_of_reviews"}}

$group: { _id: null, avgreviews: { $avg: "number_of_reviews"}}

$group: { _id: "$room_type", avgreviews: { $avg: 1}}

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