QUESTION 17 The main risk on a banks trading book is: O a. operational risk Ob.credit risk oc interest rate risk O d. market risk QUESTION 18 Open market operations (OMO) refers to Oa. When the central bank only buys Treasury securities to increase the supply of money that is on reserve in banks Ob. 'When the central bank buys and sells Treasury securities to influence market interest rates OcWhen the central bank only sells Treasury securities to reduce the supply of money that is on reserve in banks O d. None of the above