Inner Line Permit (ILP) is required for:

Domestic tourists visiting Sikkim
Foreign tourists visiting Sikkim
Travel between Sikkim and other Indian states
None of the above

The correct answer is: a) Domestic tourists visiting Sikkim

An Inner Line Permit (ILP) is an official document issued by the Government of India that is required for Indian citizens and foreign nationals to visit certain areas in India. The ILP is required to protect the cultural and environmental integrity of these areas.

Sikkim is one of the states in India where an ILP is required for all visitors, including Indian citizens. The ILP can be obtained from the Foreigners Regional Registration Office (FRRO) in Kolkata or from the Sikkim Tourism Department.

The ILP is valid for a period of 15 days and can be extended for a further 15 days. The cost of the ILP is Rs. 100 for Indian citizens and Rs. 1,000 for foreign nationals.

The ILP application process is relatively simple and can be completed online or in person at the FRRO or Sikkim Tourism Department. The application form requires the applicant to provide their personal details, passport details, and the purpose of their visit to Sikkim.

Once the application is approved, the applicant will be issued an ILP that must be carried at all times while in Sikkim. The ILP must be surrendered to the police on departure from Sikkim.

The ILP is a necessary requirement for visiting Sikkim and should be obtained well in advance of your travel. For more information on the ILP, please visit the website of the Sikkim Tourism Department.

Option b) Foreign tourists visiting Sikkim is incorrect because an ILP is required for all visitors to Sikkim, including Indian citizens.

Option c) Travel between Sikkim and other Indian states is incorrect because an ILP is only required for travel to Sikkim. Travel between Sikkim and other Indian states does not require an ILP.

Option d) None of the above is incorrect because an ILP is required for all visitors to Sikkim, including Indian citizens.