Which of the following is an unconventional monetary policy tool used by the Reserve Bank of India?

Read the following passage and answer the next 3 questions (Q18-Q20) Monetary policy is the process of drafting, announcing, and implementing the plan of actions taken by the central bank, currency board, or other competent monetary authority of a country that controls the quantity of money in an economy and the channels by which new money is supplied.  Monetary policy consists of the management of money supply and interest rates, aimed at meeting macroeconomic objectives such as controlling inflation, consumption, maintaining growth and liquidity. This is achieved by actions such as modifying the interest rate, buying or selling government bonds, regulating foreign exchange (forex) rates, and changing the amount of money banks are required to maintain as reserves.