Explanation:

- Statutory Liquidity Ratio (SLR): This is the percentage of a bank's total deposits that it must maintain in the form of liquid cash, gold, or other securities. It is not kept with the RBI but is maintained by the bank itself.

- Deposit Ratio: This term generally refers to the ratio of different forms of deposits in a bank and is not a prescribed reserve held with the RBI.

- Cash Reserve Ratio (CRR): This is the ratio of a bank's total deposits that must be maintained with the RBI in the form of liquid cash. It helps the RBI control liquidity in the banking system.

- Legal Reserve Ratio: This is not a standard term used in the context of Indian banking regulations.