Explanation:

- Repo Rate: This is a method used by central banks to control money supply. By altering the repo rate, central banks influence the cost of borrowing and lending in the economy.

- Reverse Repo Rate: This is another tool for credit control, where banks deposit excess funds with the central bank, which helps in controlling liquidity and money supply.

- CRR (Cash Reserve Ratio): Banks are required to hold a certain percentage of their deposits as reserves with the central bank, helping regulate money flow.

- Managed Floating: This is about exchange rate management, where monetary authorities intervene in the foreign exchange market to stabilize or alter the exchange rate. It's not primarily a method of credit control.