Assuming 100,000 dollars are invested today, for the next three years 12,000 dollars are returned annually and in the fourth year a lump sum of 80,000 dollars is provided. What is the IRR of this series of cash flows? Assuming a reinvestment rate of 15%, what is the MIRR of this cash flow?

a) IRR: 4.52%/MIRR: 6.35%

b) IRR: 4.52%/MIRR: 7.23%

c) IRR: 5.71%/MIRR: 7.23%

d) IRR: 5.71%/MIRR: 6.36%