What are the basic components required for a local network to function in addition to computers?

The correct answer highlights the essential elements needed for a local network to operate effectively. Ethernet cards (or network interface cards) are crucial because they allow computers to communicate over the network. A common protocol, such as TCP/IP, is necessary to standardize this communication, ensuring that devices can understand each other and share data effectively. Ethernet cables serve as the medium for data transmission between devices, allowing for physical connectivity. A hub, while less common today in favor of more advanced devices like switches, can still serve to connect multiple Ethernet cables from different devices, facilitating communication among them.

In contrast, while other options contain components related to networking, they do not encompass all the basics needed specifically for a local network. For instance, internet connections and routers are essential for connecting to the internet but are not strictly necessary for the local network itself. Similarly, network administrators and operating systems play roles in managing and running networks but are not fundamental components of the network's architecture. Overall, the selected answer captures the critical hardware and protocols required to establish a functioning local network.