Which of the following events directly led to the accession of Jammu and Kashmir to India in 1947?
1
The invasion of Kashmir by Pakistani tribal forces and the subsequent appeal for military assistance by the Maharaja of Kashmir, Hari Singh.
2
The signing of the Instrument of Accession by Maharaja Hari Singh, following the intervention of the United Nations.
3
The establishment of a plebiscite under the United Nations' supervision, as demanded by Pakistan.
4
The incorporation of Kashmir into India through a military annexation after the Indian government's diplomatic intervention in the region.