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Each data type has a corresponding number that can be used with the _______ operator to query documents by BSON type.

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Each data type has a corresponding number that can be used with the _______ operator to query documents by BSON type.

(a) $type

(b) $server

(c) $agent

(d) None of the mentioned

I have been asked this question in a national level competition.

My question is from BSON in section GridFS, BSON Datatype and Administration Concepts of MongoDB

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Correct answer is (a) $type

The best I can explain: $type selects the documents where the value of the field is an instance of the specified numeric BSON type.

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