Some Indian territory was transferred in 2015 to Bangladesh by followi

Some Indian territory was transferred in 2015 to Bangladesh by following which procedure?

By an agreement between the Government of India and the Government of Bangladesh
By a legislation passed by the Parliament amending Schedule 1 to the Constitution of India
By amending Schedule 1 to the Constitution of India by exercising amending power of the Parliament
By amending Schedule 1 to the Constitution of India by exercising amending power of the Parliament and ratification by sixteen State Legislatures
This question was previously asked in
UPSC CDS-2 – 2016
The transfer of Indian territory to Bangladesh in 2015 was done to implement the 1974 Land Boundary Agreement and its 2011 Protocol. According to the Supreme Court’s ruling in the Berubari Union case (1960), the transfer of Indian territory to a foreign country requires a constitutional amendment under Article 368. Consequently, the 100th Constitutional Amendment Act, 2015, was passed by Parliament to give effect to the transfer of territories, including amending the First Schedule of the Constitution which lists the States and the Union Territories and their territories. This amendment was passed using the amending power of Parliament under Article 368.
– Transfer of Indian territory to a foreign country requires a constitutional amendment (Berubari case ruling).
– The 2015 transfer to Bangladesh was implemented through the 100th Constitutional Amendment Act, 2015.
– This amendment modified the First Schedule of the Constitution.
– The amendment was enacted using the power under Article 368.
– This specific amendment did not require ratification by state legislatures under the proviso to Article 368(2).
The 100th Amendment involved the exchange of 111 Indian enclaves in Bangladesh for 51 Bangladeshi enclaves in India, as well as addressing adverse possessions and the demarcation of a 6.1 km undefined border stretch. It settled a long-standing border dispute. The process involved amending the Constitution under Article 368, which requires passage by a special majority in both Houses of Parliament.