Which of the following is correct error when loading JAR

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Which of the following is correct error when loading JAR file with duplicate name?

1. java.lang.ClassNotFound
2. java.io.NullPointerException
3. java.lang.DuplicateClassError
4. java.lang.ClassFormatError
5. None of these

Correct Option: D

java.lang.ClassFormatError: Duplicate Name error is thrown when .class file in the JAR contains a class whose class name is different from the expected name.