Consider the following scenario:

Abdalla has a small business. He owns a big truck and he makes a living from buying, transporting, and selling things for others, in big volumes (wholesale), as his truck is allowing him to transport. For Abdalla, the most important thing is to fill his truck in the best possible manner maximizing the profit for the occupied space/volume and for the distances he needs to transport the products.

Therefore, Abdalla uses a smart web application - built as a web-site, that is allowing him to virtually load/fill his truck with products while maximizing his profit for the load. There is a "Virtual Truck" inside the application allowing Abdalla to simulate the loading of his truck. When he is satisfied with the outcome, he orders his truck to be loaded as he established in the application, with all the items he collected in the "VirtualTruck", then he pays for the products, and he calls it a deal.

In short, the "VirtualTruck" is allowing Abdalla to add items, to change the quantity of each item, to change the place occupied by the items in his truck, to finalize his order as a check-out summary, and to make the payment for products, loading, and gas.

REQUIREMENTS:

1. Enumerate in the correct order the tiers/layers in the Multilayer Architectural Pattern. (0.4 points each, 0.6 points the right order, 2 points total)

2. Consider you know the "VirtualTruck" online-system is implemented using the Multilayer Architectural Pattern insisting and then:

2.1 describe in detail (one paragraph of 2-3 lines) the interaction between the First Tier/Layer and Abdalla (the end-user) - 2 points

2.2 describe in detail (one paragraph of 2-3 lines) the role of (what happens in) the Second Tier/Layer - 2 points

2.3 describe in detail (one paragraph of 2-3 lines) the role of (what happens is) the Third Tier/Layer - 2 points

2.4 describe in detail (one paragraph of 2-3 lines) the role of the Fourth Layer (1 point) and what software and hardware are used in this layer (1 point)