Security: Treasury AAA Corporate BBB Corporate B Corporate Yield (%): 5.2 15.4 16.8 17.2 The above table shows the yields to maturity on a number of two-year, zero-coupon securities. What is the credit spread on a two-year, zero-coupon corporate bond with a B rating? O A. 2.4% 2.8% O O C. 1.6% OD. 2.0%