If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?

• A.The query used an index to fetch the results
• B.The query returned 30000 documents after scanning the documents
• C.The query returned 0 documents
• D.None of the above

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Which of the following are valid json documents? Select all that apply.

• A.{"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
• B.{ }
• C.{"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
• D.{"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}

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In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

• A.2
• B.Even
• C.Depends on the application architecture
• D.Odd

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In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

• A.mongos
• B.mongod
• C.individual language drivers
• D.mongo shell

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Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

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