Your firm spends $600,000 per year (end of the year payment) in regular maintenance of its equipment Due to the COVID-19 economic downturn, the firm considers forgoing these maintenance expenses for the next three years. If it does so, it expects it will need to spend $2.7 million in year 4 (end of the year payment) replacing failed equipment. Does the IRR rule work for this decision?, For what MARR is forgoing maintenance a good decision? O a. IRR rule does not work, Positive NPW only if MARR > 21.69% O b. IRR rule works, Positive NPW only if MARR> 21.69% OC IRR rule works, Positive NPW only if MARR