With reference to the Special Intensive Revision (SIR) of electoral rolls, consider the following statements:
- Deletion of a name from the electoral rolls under SIR amounts to a determination of citizenship.
- The Election Commission's mandate under Article 324 extends to the preparation of electoral rolls but not to citizenship adjudication.
- Final determination of citizenship under the Citizenship Act, 1955 rests with the Union Government.
- Welfare scheme eligibility, such as under the Public Distribution System, may lawfully be made contingent on SIR exclusion status.
How many of the above statements are correct?