The correct answer is: d) All of the above.
The Inner Line Permit system was introduced by the British in the late 19th century to protect tribal lands and cultures, control migration, and facilitate trade with Tibet.
The system restricts the entry of non-tribal people into certain areas, and requires those who do enter to obtain a permit. This is intended to protect the traditional way of life of the tribal people, and to prevent them from being exploited by outsiders.
The system also helps to control migration into these areas, which can put a strain on resources and lead to conflict.
Finally, the system facilitates trade with Tibet, by allowing goods to be transported through these areas without having to go through Indian customs.
The Inner Line Permit system has been controversial since its inception. Critics argue that it is discriminatory and that it prevents tribal people from accessing basic services. Supporters argue that it is necessary to protect tribal lands and cultures, and that it helps to maintain law and order in these areas.
In recent years, there have been calls for the system to be reformed or abolished. However, the government has so far resisted these calls, arguing that the system is necessary to protect the interests of tribal people.