4) Transportation planning is a process for making decisions that need to be made for the planning and operation of the system. Of the following, select all that represent the best elements for a sound transportation planning process. a) Presenting information from the process to decision makers in a readily understandable and useful form. b) Using a single variable, such as locations of land-use, to identify the transportation needs for a study area. c) Relating alternative decisions to the goals and objectives established for an urban area, agency, state, or firm. d) Questioning opportunities and assuming no limitations for the future of the transportation system