Security: Yield (%): Treasury 5.2 AAA Corporate 5.4 BBB Corporate 6.8 B Corporate 8.2 The above table shows the yields to maturity on a number of four-year, zero-coupon securities. What is the credit spread on a four-year, zero-coupon corporate bond with a B rating? OA. 2.4% OB. 3% OC. 3.6% OD. 4.2%