Which of the following is/are true about combiners?

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Question: Which of the following is/are true about combiners?

1.Combiners can be used for mapper only job

2. Combiners can be used for any Map Reduce operation

3.Mappers can be used as a combiner class

4.Combiners are primarily aimed to improve Map Reduce performance

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  1. Which of the following is/are true about combiners?
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