Which of the following statement(s) is/ are found to be correct? I. General Bakht Khan led the revolt of sepoys at Delhi during the time period of 1857. II. The Rajas of Patiala, Jind, Gwalior, Hyderabad and Nepal helped the British to suppress the revolt. III. Tantia Tope successfully carried out guerrilla warfare against the British during 1857 revolt and was betrayed by a fellow rebel and was captured and put to death by the British.