Use of the effective-interest method in amortizing bond premiums and discounts results in1. a greater amount of interest income over the life of the bond issue than would result from use of the straight-line method.2. a varying amount being recorded as interest income from period to period.3. a variable rate of return on the book value of the investment.4. a smaller amount of interest income over the life of the bond issue than would result from use of the straight-line method.