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Which document can be a correct output for the following aggregate pipeline d...

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Which document can be a correct output for the following aggregate pipeline

db.users.aggregate([

{$match: {"title" : /Star Wars/i} },

{$unwind : "$actors" },

{$group : {"_id" : "$actors._id", "val": {$avg: "$rating"}} },

{$match: {"val":{$gt:3.5}}} ]);

{"rating" : 5}

{"val" : 4}

{"_id" : 1, "val" : 4}

100%

{"_id" : ["Mark", "Hamill"], "val" : 4}

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