K Security: Yield (%): Treasury 5.2 AAA Corporate 5.4 BBB Corporate 6.8 B Corporate 9.2 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. 3.2% B. 5.6% O C. 4.8% OD. 4%