Which of the following statement is incorrect?

a. An example of a perpetuity is the dividends typically paid on a preferred stock issue.

b. Most of the answers are correct.

c. With an amortized loan, the equal amounts is paid off that include only the simple interest on the principal.

d. Annuities in which the cash flows occur at the beginning of each of the specified time periods are known as annuities due.

e. As the discount rate increases, the present value of a positive cash flow to be received at a particular time in the future gets closer to zero.