Consider the following statements with reference to the Line of Credit (LOC) extended by the Government of India:
1. It is a one-time development grant provided to developing countries by the Indian Government.
2. Under it, goods and services for at least 75% of the value of the contract must be sourced from India.
3. The full amount extended through LOCs should exclusively be on a Government-to-Government basis.
4. Bangladesh has been the recipient of the largest concessional credit given by India to any single country.
Which of the statements given above are correct?