Which one of the following is the correct chronological order of the conferment of the full statehood of the Indian Union?
1. Sikkim - Arunachal Pradesh - Nagaland - Haryana
2. Nagaland - Haryana - Sikkim - Arunachal Pradesh
3. Sikkim - Haryana - Nagaland - Arunachal Pradesh
4. Nagaland - Arunachal Pradesh - Sikkim - Haryana