Read the following sentences carefully:

1) The adoption of blockchain by India’s banks could help avert frauds such as the one at PNB.

2) It updates information across all users simultaneously, which would have ensured that various officials would have instantly been alerted to the creation of the LoUs.

3) Blockchain is a distributed ledger technology originally developed as an accounting system for the cryptocurrency Bitcoin.

Which of the above sentence/sentences is/are correct?