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Which of the following commands finds all the documents in the posts collection with post...

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Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

A.

db.posts.find( { post_timestamp: { $fieldtype: null } } )

B.

db.posts.find( { post_timestamp: { $type: null } } )

C.

db.posts.find( { post_timestamp : { $type; 10 > > )

D.

db.posts.find( { post_timestamp: { $fieldtype: 10 } } )

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