9 What are the four main instruments of monetary policy? A. a. Open Market Operation (purchasing and selling of Treasury bills) b. Lending Policy to Member Banks ( Changing Federal Funds Rate which affects lending of reserves between banks and the discount rate which is charged to banks that borrow directly from the Central Bank) c. Changing Reserve Requirements d. Quantitative Easing (Purchase of corporate assets) B. Open Market Operations, Lending Policy, Adequate Supervision and Regulation of Deposit Taking Financial Institutions. C. Open Market Operations, Changing Reserve Requirements, Lending Policy, Adequate Supervision and Regulation of Deposit Taking Financial Institutions. D. Open Market Operations, Changing Reserve Requirements, Quantitative Easing, Lending Policy, Adequate Supervision and Regulation of Deposit Taking Financial Institutions.What is supply-side economics and what is the general assessment of the efficacy of supply-side economics