Which of the following is incorrect statement about find and findOne operations in MongoDB?

• A.findOneQ returns the actual first document retrieved from a collection
• B.findQ returns all the documents in a collection while findOne() retrieves only the first one.
• C.find.limit(l) is not the same query as findOne()
• D.findQ and findOneQ returns cursors to the collection documents

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Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

• A.db.posts.createIndex({^commerits.author";-!});
• B.db.posts.createIndex({^comments.$.author":-l});
• C.db. posts.createIndex({^comments.author" :1});

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Update If Correct is an approach for which of the following concepts in MongoDB:

• A.Atomicity
• B.Concurrency Control
• C.Performance Management
• D.Transaction Management

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What is the maximum size of a MongoDB document

• A.There is no maximum size. It depends on the RAM.
• B.2 MB
• C.16 MB
• D.12 MB

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Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

• A.nearest
• B.primaryPreferred
• C.secondaryPreferred
• D.netLatency

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