which of the following bonds has the longest duration?

a. a 4 year maturity, 0% coupon bond

b. a 4 year maturity, 8% coupon bond

c. a 12 year maturity, 0% coupon bond

d. a 12 year maturity, 8% coupon bond

e cannot tell from the information given

In a "firm commitment", the investment banker

a. agrees to help the firm sell the stock at a favorable price and finds the best marketing arrangement for the investment-banking firm

b. agrees to help the firm sell the stock at a favorable price

c. finds the best marketing arrangement for the investment-banking firm

d. buys the stock from the company and resells the issue to the public.