Final answer:
An RCO store requires routers and switches for network traffic management, Point-of-Sale terminals for transaction processing, and servers and storage for data management, which leads to the answer D) All of the above.
Step-by-step explanation:
The question asks which network hardware must be present on the back wall of an RCO store. To answer the question, it's essential to understand the function of each type of hardware mentioned. Routers and switches are devices used to route and manage traffic between different devices on a network. Point-of-Sale (POS) terminals are specialized hardware used for processing sales transactions. Lastly, servers and storage hardware are used to store, manage, and process data. Based on the functions of these devices, the correct answer to which network hardware must be present is D) All of the above, as each serves a distinct and necessary purpose for store operations.