4. In November of 2017, Chinese e-commerce company Alibaba Group Holding Ltd. sold S7 billion in U.S.-dollar bonds, its second visit to the debt markets in three years. The company sold bonds with maturities ranging from 5.5 years to 40 years. Alibaba issued some semiannual coupon bonds at par. Comparable bonds have a current yield of 8.16 percent, an effective annual yield of 8.68 percent, and a yield to maturity of 8.50 percent. What coupon rate should Alibaba set on its bonds? A. 8.16 percent B. 8.50 percent C. 8.55 percent D. 8.68 percent E. 9.00 percent