Explanation:

Your answer is option:4- All of these.

- Option 1: Issue of notes

- Central banks have the authority to issue and regulate the currency notes in a country.

- Option 2: Banker to the Government and Banks

- They manage the government's accounts and facilitate transactions and borrowing needs.

- Central banks act as bankers' banks, where commercial banks hold accounts and are offered lending facilities.

- Option 3: Supply and control of money

- Central banks are responsible for monetary policy, which includes controlling money supply and interest rates to ensure economic stability.

- Option 4: All of these

- This option is correct. Central banks perform all the functions listed above.