AL Samir Development Company is considering three types of tower cranes for the construction of the new mall. The cash flows for the three types are shown below: The alternatives could be replaced with another with identical cost and benefits. The MARR is 10%. a- Which type of crane, should be selected? b- If the useful life of crane A and Crane B is 30 years, and the two projects will maintain their annual revenue and annual operation cost the same for the whole period and the salvage value for Crane B will be 0 by the end of 30 years, which type of crane, should be selected