Explanation:

- Money deposited in the bank: This is part of the money supply as it represents the funds that can be withdrawn and spent by the public.

- Money available with the public: This includes physical currency and coins in circulation that people use for transactions. It's a direct component of the money supply.

- Deposits with post office savings bank: These deposits contribute to the money supply as they function similarly to bank deposits, often having similar liquidity features.

Answer: Option 4 - All of these

All these components are part of the money supply, which includes various forms of liquid assets accessible to the public.