Given the following mutually exclusive alternatives each with economic lives of 15 years, each evaluated over a 15-year study period. MARR is 20%: Project A B C D Initial Cost $20,000 $16,000 $18,000 $12,000 Annual Benefit $10,000 $7,800 $10,000 $5,000 Annual Cost $5,000 $2,800 $5,000 $2,250 IRR 24.017% 30.69% 27.01% 21.71% a. Are all these alternatives acceptable? Why are why not, be specific b. Using the Incremental Investment Analysis Procedure evaluate the incremental values of cash flows using incremental PW at MARR as a proxy for incremental IRR, which project would you recommend? Why, be specific. Show your cash flow diagrams for each incremental analysis