Explanation:

- Option 1: Asian Development Bank (ADB)

- ADB is a regional development bank established to promote social and economic development in Asia.

- There is no widely known partnership between ADB and Commonwealth Bank of Australia for blockchain technology.

- Option 2: World Bank

- The World Bank is an international financial institution that provides loans and grants to governments for development projects.

- The World Bank has explored blockchain technology for projects like issuing blockchain-based bonds, partnership with Commonwealth Bank for blockchain.

- Option 3: BRICS Bank (New Development Bank)

- BRICS Bank focuses on mobilizing resources for infrastructure and sustainable development in BRICS and other emerging economies.

- There is no public information regarding a blockchain partnership with Commonwealth Bank of Australia.

- Option 4: RBI (Reserve Bank of India)

- The RBI is India's central bank, responsible for issuing currency, regulating the financial system, and monetary policy.

- There is no known collaboration with Commonwealth Bank on blockchain technology.

- Option 5: SBI (State Bank of India)

- SBI is the largest bank in India, offering a range of banking products and services to both individual and business customers.

- Correct Answer: SBI has signed a deal with the Commonwealth Bank of Australia for blockchain technology integration, leveraging it to improve cross-border services and trade finance.

Correct Answer: Option 2: World Bank