As the supervisor of a facilities engineering department, you consider mobile cranes to be critical equipment. The purchase of a new, medium-sized, truck-mounted crane is being evaluated. The economic estimates for the two best alternatives are shown in the accompanying table. You have selected the longest useful life (9 years) for the study period, and would lease a crane for the final three years under Alternative A. Under Alternative C, a crane would leased for the entire nine years. Based on previous experience, the estimated annual leasing cost will be $66,000 per year fin additional to the annual expenses of $28,800). The MARR is 15% per year. Which crane should be selected, using external rate of return? Be sure to indicate the "winning" external rate of return or incremental external rate of return. Alternative A Alternative B. Alternative C None of the above