Keenan Industries has a bond outstanding with 15 years to maturity, an 8.15% nominal coupon, semiannual payments, and a $1,000 par value. The bond has a 6.20% nominal yield to maturity, but it can be called in 5 years at a price of $1,050. What is the bond's nominal yield to call? Do not round your intermediate calculations.

a. 2.30%

b. 4.94%

c. 4.11%

d. 4.76%

e. 2.38%