Consider the following statements with reference to the ‘Revolt of 1857’: 1. Syed Ahmad Khan wrote “Causes of the Indian Revolt”. 2. Mangal Pande was hanged on March 29, 1857. 3. Hazrat Mahal led the revolt at Lucknow. 4. Nana Saheb led the revolt at Bareilly. Select the correct answer from the code given below: