57. The differences in rates among these issues were most probably caused primarily by:a. Real risk-free rate differences.b.Tax effects.c. Default and liquidity risk differences.d. Maturity risk differences.e.Inflation differences, Chapter 7:58.What is the coupon rate? a. 6.76 percent b. 7.00 percent C. 7.12 percent d. 13.51 percent e. 14.00 percent 57. The differences in rates among these issues were most probably caused primarily by:a. Real risk-free rate differences.b.Tax effects.c. Default and liquidity risk differences.d. Maturity risk differences.e.Inflation differences, Chapter 7:58.What is the coupon rate? a. 6.76 percent b. 7.00 percent C. 7.12 percent d. 13.51 percent e. 14.00 percent