Consider three alternatives: At the end of its useful life, an identical alternative (with the same cost, benefits, and useful life) may be installed. All the alternatives have no salvage value. If the MARR is 12%, which alternative should be selected? a) Solve the problem by payback period. b) Solve problem by future worth analysis. c) Solve the problem by benefit-cost ratio analysis. d) If the answers in parts (a), (b), and (c) differ, explain why this is the case