A person is about to retire and must choose between three retirement plan options. One provides $55,000 per year for the remainder of his life. Another provides 85% of this amount and increases by 5 percent each year. A third option gives him a $400,000 lump sum settlement. If his remaining life expectancy is twelve years, the prime interest rate is 8 percent, and he can ignore taxes, which should he choose? Would your answer be different if the prime interest rate were 15 percent and was expected to stay there for the foreseeable future