Which of the following statements on official foreign reserves of central banks are accurate assessments? (Select all that apply) (J a) It is best practice for a central bank to hold and manage all the country's official foreign reserves. (J b) It is best practice for a central bank to manage the official foreign reserves in a prudent manner and to consider the risk, liquidity, and profitability of the different assets comprising the reserves. (J ) Central banks manage the official foreign reserves on a best efforts basis and should inform the Government when the reserves decline, the reasons for the decline and the recommendations to remedy the situation. (U d) Central bank must be liable for any losses suffered because of their management of the official foreign reserves