What is the definition of "debt service"? A. How long it takes to pay off a debt, if paying the minumum amount each time period. B. The total extra cost of paying off debt issued in bonds than bills or notes, since interest rates on bonds is usually higher than those on bills or notes. C. The amount of new debt that must be issued to pay off existing debt. D. The amount of money it takes the to pay off the prinicple and interest on outstanding debt