Concept:A network device is hardware that helps connect, manage, or transfer data across a network. A port is only a connection point, not a separate network device.Explanation:A Hub, Modem, and Router are all used to build or manage a network.A Port is an interface or socket on a computer or network device where cables are plugged in.Since a port does not process or manage network traffic on its own, it is not considered a network device.Answer:C. Port