Which of the following is true? O A bank is solvent when its deposits become positive. O A bank is insolvent when its reserves become negative. A bank is solvent when its excess reserves become negative. O A bank is insolvent when its net worth becomes negative. Which of the following items serve as a unit of account? 1. $100 cash Il. checkable deposits Ill. an original Picasso painting IV. a $1,000 corporate bond that you own O I only D I and II O I, II, and Ill O 1, II, and IV O 1, 1I, Ill, and IV A primary function of a central bank is to O regulate dividend payments by corporations. act as a regulator of banks. O control the bond market. O publish statistics on banking and related financial matters