Which of the following describes the function of a network cable?

The function of a network cable is to connect devices and facilitate data flow, which is exactly what option B describes. Network cables serve as the physical medium through which data signals are transmitted between devices, such as computers, routers, and switches. By providing this connectivity, network cables enable communication and data exchange across a network, allowing devices to share information effectively.

In contrast, other options define functions that are not performed by network cables. For instance, encrypting data during transmission pertains to security processes that protect data integrity as it travels through the network but relies on protocols and not the physical layer represented by the cabling. Similarly, limiting network access is a function associated with network security measures, like firewalls and access controls, rather than the cable itself. Finally, powering network devices is achievable through specific technologies like Power over Ethernet (PoE), but standard network cables primarily function for data transmission rather than providing power.