13. You can choose one of the following prizes. If the interest rate is 5% (anmual compounding), which is the most valuable prize? (5 points) (a) $20,000 today. (b) $25,000 at the end of 5 years. (c) $1,000 at the end of each year forever. (d) $600 next year and increasing thereafter by 2% a year forever. (c) $5,000 at end of each year for 5 years