The notion of "collective security" was behind the idea of which of the following?

Question

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The concept of collective security was central to the League of Nations, which was established after World War I in an effort to prevent future wars and promote international cooperation. The idea was that member nations would work together to deter aggression and maintain peace by collectively responding to any threats or acts of aggression. However, the League ultimately failed to prevent World War II, and its successor, the United Nations, has since taken a similar approach to international relations. NATO and the Warsaw Pact were military alliances formed during the Cold War, but their primary focus was on defense against potential aggression rather than the collective security of all members.

The Notion of "Collective Security" Was Behind the Idea of Which