The Seattle Corporation has been presented with an investment opportunity which will yield cash flows of $30,000 per year in Years 1 through 4, $35,000 per year in Years 5 through 9, and $40,000 in Year 10. This investment will cost the firm $150,000 today, and the firm's required rate of return is 10 percent. Assume cash flows occur evenly during the year, 1/365th each day. What is the payback period for this investment?

a. 4.00 years

b. 4.86 years

c. 6.12 years

d. 4.35 years

e. 5.23 years