What were the two main personalities of the revolt of 1857?

What were the two main personalities of the revolt of 1857?
a. Tantya Tope and Nana Saheb
b. Nana Saheb and Rani Laxmi Bai
c. Nana Saheb and Kunwar Sing
d. Bahadur Shah Zafar and Nand Saheb

Ans: ( d )