Which of the following statements regarding Nana Saheb are correct? Choose the correct option:
I. Nana Saheb was the successor of Peshwa Baji Rao-II.
II. Nana Saheb joined the revolt of 1857 from Kanpur.
III. His rebellion collapsed in the beginning of 1857.
IV. Nana Saheb went to Nepal in 1857.
Options: