Tom has an investment horizon of 4 years (this means he will plan to sell or liquidate his investments at the end of 4 years) and is considering two possible bond investments. Bond A, is a 6-year, 4% annual coupon bond that is currently trading at a YTM of 6%. Bond B, is a 10-years, 3% annual coupon bond that is also trading at a YTM of 6%. Tom understands that he faces interest rate risk or the risk that interest rates will change. Which of the two bonds has greater interest rate risk and briefly explain why.