Explanation:

- The Quad Group, also known as the Quadrilateral Security Dialogue, is a strategic forum.

- It consists of four countries: United States, Australia, India, and Japan.

- These nations collaborate on issues such as maritime security, infrastructure development, and climate change.

- Canada is not a part of the Quad Group. While Canada is often engaged in international partnerships, it does not belong to this specific grouping.

- Therefore, among the options given, Canada is the correct answer as the nation that is not part of the Quad Group.

Canada

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