Boeings 6.875% semi-annual coupon bonds with the face value of $100 mature on 10/15/2043. They are traded in the market as of April 2nd, 2021 at $119.50. Assuming that 20 Year Treasury Yield is 3.27%, which one would be the best estimate of Boeing's default risk premium? Group of answer choices

a.4.20%

b. 2.10%

c. 3.20%

d. 2.20%