7. As a winner of a lottery you can choose one of the following prizes: (a) 1,000,000 now. (b) 1,700,000 at the end of five years. (c) 135,000 a year for ever, starting in one year. (d) 200,000 for each of the next 10 years, starting in one year. If the time valuc of moncy is 9 per cent, which is the most valuable prize