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Which of the following statements is correct?

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Which of the following statements is correct?

1. Master and slaves files are optional in Hadoop 2.x

2. Master file has list of all name nodes

3. Core-site has hdfs and MapReduce related common properties

4. hdfs-site file is now deprecated in Hadoop 2.x

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Correct answer is 

Core-site has hdfs and MapReduce related common properties

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