5.1 TM354 module materials introduce the concept of Facade layer to further reduce 4 Marks coupling between core systems from the user interface. Based on this concept, using your own words, briefly describe the features and advantages of a faade architectural pattern. 5.2 6 Marks As you have learned, the Facade hides all the details of the model from the user interface. Below given a scenario about online shopping. An online shop may act as a front for a number of individual suppliers but this is hidden from customers, who interact with a single ordering and payment system. The shop may accept card payments, and convert the amount charged from the currency used where the shop is based into the one used in the customer's country. . Draw a simple facade pattern UML diagram to demonstrate this scenario. You must include appropriate methods in your diagram. 5.3 In unit 7 you have learnt that model elements of almost any sort can be grouped into 6 Marks coherent units called packages. Briefly describe the concept of packages. Support your answer with relevant diagram/s. Demonstrate the concept of visibility of elements between packages. Describe the uses and advantages of packages Modify the use case diagram you have developed in Question-1 into a use case package 4 Marks diagram. . 5.4