A 60-year old customer has a 401(k) account with your firm that has $280,000, mainly invested in growth mutual funds. The customer has an elderly widowed aunt who has died, and her estate attorney has contacted him, notifying him that he has been left $100,000 as an inheritance. The customer is single and has an annual income of $100,000 per year. He wants to use the inheritance to buy a retirement home, which he expects to do in 7 years. Over this investment time horizon, the general expectation is that interest rates will rise. The best recommendation to the customer is to invest the $100,000 in: