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An important difference between evaluting ME alternatives by AW or PW is that: Select one: O a. LCM for different life alternatives is used in PW but not in AW analysis. O b. LCM for different life alternatives is used in AW but not in PW analysis. O c. LCM for different life alternatives is used in FW but not in AW analysis. O d. none of these answers. The evaluation of economic proposals require: Select one: O a. inclusion of salvage value to add the cost of the obselete proposal. O b. cash flow estimates and mathamtical techniques to calculate the measure of worth. O c. guidline for selecting the best ME. O d. cash flow estimates to calculate the lowest first-cost alternative. The of the alternatives must be compared over the same number of years to satisfy the equal-service requirement. Select one: O a. AW and FW b. LCM O C. PW O d. AW