Assume the zero-coupon yields on default-free securities are as summarized in the following table: Maturity (years) 1 2 3 4 5 Zero-coupon YTM 4.00% 4.30% 4.50% 4.70% 4.80% Consider a four-year, default-free security with annual coupon payments and a face value of $1,000 that is issued at par. What is the coupon rate of this bond?