18. In a bond ladder strategy, a. one-half of funds are invested in short duration bonds, and the rest are invested in long duration bonds. b. 75 percent of funds are invested in short duration bonds, and the rest are invested in long duration bonds. c. 25 percent of funds are invested in short duration bonds, and the rest are invested in long duration bonds. d. an equal amount of funds is invested in a wide range of maturities. e. all the funds are invested in long duration bonds