B. RTGS Explanation: Cash reserve Ratio (CRR) is the amount of funds that the banks have to keep with the RBI. Statutory liquidity ratio (SLR) is the Indian government term for reserve requirement that the commercial banks in India require to maintain in the form of gold, government approved securities before providing credit to the customers. Deposit insurance is mandatory, and pays claims from a pool of funds to which every depository institution regularly contributes.