Option 1 -> RBI is the apex monetary institution that regulates India's banking and financial system.
Option 2 -> Commercial banks are retail banks like SBI, HDFC that provide banking services to the public.
Option 3 -> Cooperative banks are formed on cooperative principles and serve specific communities or groups.
Option 4 -> Regional rural banks are specialized banks created to serve rural and agricultural sectors.
Hence, Option 1: Central Bank -> The Reserve Bank of India is officially known as the Central Bank of India. It was established in 1935 and acts as the country's monetary authority, regulator of the banking system, issuer of currency, and manager of foreign exchange. As the central bank, RBI controls monetary policy, supervises commercial banks, manages government securities, and maintains financial stability in the economy.-> correct