Hayden Company is considering the acquisition of a machine that costs $402,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash flow of $90,000, and annual income from operations of $76,500. What is the estimated cash payback period for the machine? O a. 6.4 years Ob. 5.3 years O c. 4.5 years Od. 1.2 years