$4\mathrm{.}1$ You have been appointed as the lead technical consultant for an e$-$commerce company. The company is preparing for a crucial meeting with its management team, who are eager to understand how the architecture layers of the Internet affect the development and functionality of their e$-$commerce service. As the lead technical consultant, your task is to explain the architecture layers of the Internet and their implications on the development and functionality of the company's e$-$commerce service to the management team. $(25)$