Max has a federal tax rate of 39.3%, the top rate, and he lives in South Dakota, which has no state income tax. He believes that the economy will improve somewhat, and that the annual inflation rate...

Max has a federal tax rate of 39.3%, the top rate, and he lives in South Dakota, which has no state income tax. He believes that the economy will improve somewhat, and that the annual inflation rate will soon rise from 2% to 3%. From the following list, which bond investment should Max buy to add to his diversified portfolio?