20. Three main tools of monetary policy options include: Select one: O a. Tax rate changes, changes in government expenditures, and open-market operations O b. Changes in government expenditures, the reserve ratio, and the interest rate O c. The interest rate, the reserve ratio, and open market operations O d. Tax rate changes, the interest rate, and open-market operations 55. The fiscal policies that aim to increase AD are known as: Select one: O a. Fiscal Stance Policies O b. Stabilisation Policies c. expansionary Fiscal Policy d. Fiscal Drag