Explanation:

- Option 1: International Atomic Energy Agency (IAEA)

- Focuses on nuclear energy and its safe, secure, and peaceful use.

- Does not publish the Energy Architecture Performance Index.

- Option 2: World Bank

- Provides financial and technical assistance for development projects globally.

- Unrelated to the Energy Architecture Performance Index.

- Option 3: World Economic Forum

- Correct! Publishes the Global Energy Architecture Performance Index.

- Analyzes nations' energy systems in terms of economic growth, environmental sustainability, and energy security.

- Option 4: United Nations Environment Programme (UNEP)

- Promotes environmental sustainability.

- Does not produce this specific index.