Which of these methods is used to add elements in vector

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Which of these methods is used to add elements in vector at specific location?

1. set()
2. add()
3. addElement()
4. AddElement()
5. None of these

Correct Option: C

addElement() is used to add data in the vector, to obtain the data we use elementAt() and to first and last element we use firstElement() and lastElement() respectively.