Explanation:

- Option 1: Issue of notes

- Central banks are responsible for issuing and regulating the national currency.

- They ensure the currency remains stable and meets economic demands.

- Option 2: Banker to the Government and Banks

- Central banks manage the accounts of the government, facilitating receipts and payments.

- They also provide banking services to commercial banks, supporting the banking system.

- Option 3: Supply and Control of money

- Central banks regulate money supply by adjusting interest rates and conducting open market operations.

- Their monetary policy aims to maintain economic stability and growth.

- Option 4: All of these (Correct Answer)

- Central banks perform all the functions listed above.

- They are crucial for the stable functioning of an economy.