Assume that you are attempting to fund a $50,000,000 liability associated with the clean-up of an environmental site that will be due in seven years.  If you don't meet the liability you will be out of business.  You have an amount of money to invest today that you feel will be sufficient.  How might you manage a bond portfolio to ensure that it will be enough at the time you need it?  Give two alternatives.  Be sure you explain how the alternatives work so that even a government regulator could understand it.  As part of your answer be sure to discuss the two risks that bond holders are exposed to because of changing interest rates over time.