Which one of the following statements is true concerning the duration of a perpetuity? O The duration of a perpetuity cannot be calculated. The duration of a 15% yleld perpetuity that pays $100 annually is equal to that of 15% yleld perpetulty that pays $200 annually. O The duration of 15% yleld perpetulty that pays $100 annually is longer than that of a 15% yleld perpetulty that pays $200 annually. O The duration of a 15% yleld perpetuity that pays $100 annually is shorter than that of a 15% yleld perpetuity that pays $200 annually