Suppose you insert the following documents into companies collection: db.companies.insertMany([ {"_id": 1, "name": "Facebook"}, {"_id": 1, "name": "Twitter"}, {"_id": 2, "name": "Tesla"}, {"_id": 3, "name": "Amazon"} ], {"ordered": false}) Select all true statements about this operation. (select 3)

• A.Two documents will be inserted into the collection.
• B.This insert is unordered.
• C.Three documents will be inserted into the collection.
• D.MongoDB will insert each document with a unique _id value into the collection.
• E.One document will be inserted into the collection.

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Select all true statements about the $merge stage.

• A.$merge stage allows us to output the documents to a collection in the same or different database.
• B.$merge stage allows us to output the documents to a sharded collection.
• C.$merge stage must be the last in the pipeline.

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You have the following replica set configuration: conf = { "_id": "replset", "version": 1, "protocolVersion": 1, "members": [ { "_id": 0, "host": "192.168.120.24:27017", "priority": 2, "votes": 1 }, { "_id": 1, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 }, { "_id": 2, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 } ] } Select all true statements about this configuration.

• A.This configuration is incorrect. You can only specify a priority of 0 or 1.
• B.This configuration is incorrect. Host information must be unique for each member in a replica set.
• C.This configuration is incorrect. Replica set cannot have three members.
• D.This configuration is correct.

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Suppose you have a books collection with title field. Which of the following queries will return all books with a title ending in 'ian'?

• A.db.movies.find( { title: { $regex: /.*ian$/ } } )
• B.db.movies.find( { title: { $text: /.*ian$/ } } )
• C.db.movies.find( { title: { $regex: /.*ian/ } } )
• D.db.movies.find( { title: { $regex: /ian/ } } )

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Which command do you use to display all indexes in routes collection?

• A.db.routes.indexes()
• B.db.routes.dropIndex()
• C.db.routes.getIndexes()
• D.db.routes.dropIndex()

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