Heidi Company is considering the acquisition of a machine that costs $410,410. The machine is expected to have a useful life of six years, a negligible residual value, an annual net cash flow of $100,100, and annual operating income of $77,000. What is the estimated cash payback period for the machine (round to one decimal point)? Oa. 2.3 years Ob. 5.3 years Oc. 4.1 years Od. 1.3 years