A.Returns 10 comments, beginning with the last

B.Returns 5 comments, beginning with the first 10 items

C.Returns 10 comments, beginning with the first

D.Returns 5 comments, beginning with the last 10 items

A.findQ returns all the documents in a collection while findOne() retrieves only the first one.

B.findQ and findOneQ returns cursors to the collection documents

C.findOneQ returns the actual first document retrieved from a collection

D.find.limit(l) is not the same query as findOne()

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

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

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

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

A.If the allocated space for a capped collection exceeds, it stops inserting new documents

B.Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"

C.Fixed Size

D.High-throughput operations that insert and retrieve documents based on insertion order

A.replicaset primary node

B.mongos node

C.Any node

D.config server node