Flat money is Select one: O a. promissory notes issued by an Italian car manufacturer. O b. money that is not convertible into any commodity. O c. money that is only convertible into gold. O d. money that is not officially legal tender, but is widely accepted as a means of payment.What is inflation? Select one: O a. A rise in the level of house prices. O b. An increase in the money supply. O c. A continued increase in the average student waist measurement. O d. None of these statements is correct