With reference to various Constitutional Amendments and their subject matter, consider the following pairs:
Constitutional Amendments — Subject matter
1. 42nd Amendment Act,1976 — Deleted Fundamental right to property
2. 52nd Amendment Act, 1985 — Anti defection law
3. 61st Amendment Act,1989 — Reduced voting age from 21 to 18
4. 100th Amendment Act,2015 — Replaced collegium system with National Judicial Appointments Commission
How many pairs given above are correct?