Political science

Political science
Which of the four types of proliferation represents the greatest threat to international security? Why?

Type I: Vertical, Conventional that is to buildup of arsenals of conventional weapons within a country

Type II: Horizontal, Conventional, which is to spread of conventional weapons across borders

Type III: Vertical, weapons of mass destruction, which is to buildup or development of Nuclear, Biological, or
Chemical weapons within a country

Type IV: Horizontal, weapons of mass destruction, which is to spread of WMDs or WMD technology across borders.

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