A power supply can be obtained from two vendors. The first vendor quoted the power supply $80 while the second vendor quoted the power supply $110. Knowing that the first vendor power supply is less reliable with MTTF of 1200 days and MTTR of 5 hr, while the second vendor has MTTF of 2200 days and MTTR of 8 hr. If power supply failed it must be replaced at the same unit cost. The labor rate is $40 per hour and the design life is 8 years which power supply should be used?

A. We don't care about the cost we should look at other measures B. The second vendor power supply C. Both costs are the same D. The first vendor power supply