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Which of the following is a singleton instance class?

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Which of the following is a singleton instance class?

(a) LargeObjectLoader

(b) FieldMapProcessor

(c) DelimiterSet

(d) LobSerializer

This question was posed to me by my school principal while I was bunking the class.

I would like to ask this question from Introduction to Sqoop topic in portion ZooKeeper, Sqoop and Cassandra of Hadoop

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The correct choice is (a) LargeObjectLoader

To explain I would say: Lifetime is limited to the current TaskInputOutputContext’s life.

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