Commercial banks in Country A hold no excess reserves. The required reserve ratio is 0.1. The central bank of Country A has become concerned about a steep decline in investment spending.(a) Calculate the simple money multiplier. Show your work.(b) Identify an open market operation that Country A’s central bank is likely to implement to address the decline in investment spending.(c) Draw a correctly labeled graph of the money market and show the effect of the central bank’s policy identified in part (b) on the nominal interest rate.(d) Explain the effect of the change in part (c) on aggregate demand in the short run.