Which of the following statements about the first act of the Revolt of 1857 is/are true?

1. It occurred in Meerut when two sepoys stole a superior officer’s rifle.

2. It began when the Rani of Janshi declared war on the British.

3. It began when Mangal Pandey fired at a European officer in Meerut.

4  It began when Mangal Pandey fired at a European officer in Barrackpore.

Select the correct answer using the codes given below