Which one of the following is the annuity present value formula?



a. C ´ {{1 - [1/(1 r)t]}/r}

b. C ´ {1 - [1/(1 r)t]} - r

c. C ´ {1 - [r/(1 r)t]}/r

d. C ´ {{1 - [1/(1 ´ r)t]} ´ r}

e. C ´ {1 - [r/(1 ´ r)t]} ´ r