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Explain Which of these is a method of ListIterator used to obtain index of previous element?

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Which of these is a method of ListIterator used to obtain index of previous element? (a) previous() (b) previousIndex() (c) back() (d) goBack() The question was posed to me in homework. Origin of the question is Iterators in section java.util – The Collections Framework of Java Select the correct answer from above options

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The correct choice is (b) previousIndex() For explanation I would say: previousIndex() returns index of previous element. if there is no previous element then -1 is returned.

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