In which of the following situations would it not be appropriate to use the following formula: PV = Go + C/(1+ ) + C(1+0)2 + ... + C,/(1+n)" when determining the present value (PV) of a cash flow stream? O A. when the discount rate is high O B. when short-term and long-term interest rates vary widely O C. when yield curves are flat OD. when the inflation rate is high