Stephens, Inc. is considering investing in one of two mutually exclusive 4-year projects. Project A requires equipment with a cost of $140,000 and increases net income by $5,000, $10,000, $20,000 and $30,000 in years 1-4, respectively. Project B requires equipment with a cost of $200,000 and increases cash flow by $70,000 per year in years 1-4. Both projects have a 4-year life and the equipment will be depreciated using straight- line depreciation. What is the payback period of project A? Select one: O a. The project never pays back. O b. 2 years. C. 3 years O d. 4 years. e. None of the above