Explanation:

The World Bank and the Commonwealth Bank of Australia (CommBank) have teamed up to enable recording of secondary market bond trading using blockchain tech.
The institutions announced that their successful recording of a secondary transaction for bond-i, a blockchain-operated debt instrument, on a distributed ledger shows the “vast potential” of the technology, and marks the first bond to have both issuance and trading recorded on a blockchain platform.
Bond-i was first issued last August by the World Bank, with the CommBank being a sole arranger. The experiment helped the World Bank raise $81 million at the time.

Hence option 5 is correct answer