Consider the following statements regarding the Indo-Bangladesh Extradition Treaty:

1. The treaty mandates the extradition of individuals charged with crimes punishable by at least five year of imprisonment.

2. The treaty includes provisions that allow extradition to be refused if the crime is of a political nature.

3. The 2016 amendment to the treaty requires concrete evidence to be provided for initiating the extradition process.

Which of the statements given above are correct?