When was 'The anti-ballistic missile treaty' signed?

1972

The correct answer is Option 4 - 1972

The anti-ballistic missile treaty was signed in 1972.

The Anti-ballistic Missile (ABM) Treaty in 1972 tried to stop the United States and the Soviet Union from using ballistic missiles as a defensive shield to launch a nuclear attack. While it did allow both countries to deploy a very limited number of defensive systems, it stopped them from large-scale production of those systems.