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If two threads access the same hashmap at the same time, what would happen?

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If two threads access the same hashmap at the same time, what would happen? (a) ConcurrentModificationException (b) NullPointerException (c) ClassNotFoundException (d) RuntimeException I had been asked this question in an online interview. Asked question is from Data Structures-HashMap topic in portion java.util – The Collections Framework of Java Select the correct answer from above options Java questions and answers, Java questions pdf, Java question bank, Java questions and answers pdf, mcq on Java pdf, Java questions and solutions, Java mcq Test , Interview Java questions, Java Questions for Interview, Java MCQ (Multiple Choice Questions),Core Java Questions, Core Java MCQ,core java interview questions for experiencedcore java interview questions for 3 years experience,java programming questions,core java interview questions for freshers,java interview questions and answers for freshers, java programming questions and answers pdf, java interview questions for beginners

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Right option is (a) ConcurrentModificationException The best I can explain: The code will throw ConcurrentModificationException if two threads access the same hashmap at the same time.

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