Which of the following States are together called as seven sister states? (1) Tripura, Meghalaya, Assam, Arunachal Pradesh, Nagaland, Manipur, Mizoram (2) Sikkim, West Bengal, Assam, Arunachal Pradesh, Nagaland, Manipur, Mizoram (3) Sikkim, West Bengal, Meghalaya, Assam, Arunachal Pradesh, Nagaland, Tripura (4) Tripura, Meghalaya, Assam, Orissa, Sikkim, Manipur, Mizoram