Extension of the International boundaries of India along with their neighbouring countries in ascending order are

Which one of the following states of India has an international boundary on its three sides?

Which country shares the longest land border with India?

Durand Line demarcated the Indian boundary with which of the following countries?

In India, how many States/Union Territories have more than two international boundaries?

Which State of India has borders with three countries namely Nepal, Bhutan and China?