Which of the following statements is/are correct about the partition of Bengal, 1905?
1. The day partition took effect - 16 October 1905, was declared a day of mourning throughout Bengal.
2. The decision to partition Bengal was announced on 19 July, 1905
3. All of the given options
4. On September 1, the Government announced that partition was to be effected on 16 October 1905.