Which of the following has the highest Present Value? Select one: a. $800/yr. for 9 years discounted at 9%. b. $800/yr. for 9 years discounted at 7%. c. $600/yr. for 9 years discounted at 9%. d. $600/yr. for 9 years discounted at 7%. e. $800/yr. for 10 years discounted at 7%.