Determining the Appropriate Mix of Systems and Building Your Solution and Presentation
You would typically start by quickly skimming through the scenario to understand the big picture and build some initial thoughts about the solution. Then, you should go through the scenario again, section by section, and incrementally build your solution.
Understanding the Current Situation
Starting with the first part of the scenario, the sections starting with the statements The following PUB employees will be using the new system and PUB has identified external users who will also be using the system can help you identify the different roles and personas involved and determine the licenses needed for each.
That paragraph on its own can give you a good idea of the type of licenses you will need, though you will need to go through the entire scenario before finalizing it. You can start by drawing the actors diagram. You will add the licenses to it after you have formalized a better idea...