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
(a) $type
(b) $server
(c) $agent
(d) None of the mentioned
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.