M pic is evaluating three possible investment projects and uses a 10% discount rate to determine their net present values. Investment A $000 Initial investment 400 Incremental cash ows Year 1 100 Year 2 120 Year 3 140 Year 4 120 Year 5 100 Net present value 39 What is the payback period of investment A? O a. 3 years O b. 4 years 4 months 0 c. 3 years 4 months O o. 4 years