What happens if two threads simultaneously modify TreeSet?

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Both threads can perform action successfully

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ConcurrentModificationException is thrown

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Both threads can perform action successfully

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FailFastException is thrown

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IteratorModificationException is thrown

1.	What happens if two threads simultaneously modify TreeSet?
A.	ConcurrentModificationException is thrown
B.	Both threads can perform action successfully
C.	FailFastException is thrown
D.	IteratorModificationException is thrown
Answer» B. Both threads can perform action successfully

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