A network interface hardware address, also known as a MAC (Media Access Control) address, is a unique identifier assigned to network interfaces for communications on the physical network segment.
* Domain name: A human-readable address for network resources.
* IP address: A logical address used for identifying devices on a network.
* Workstation name: A human-readable name assigned to a computer.
* MAC address: The correct answer, which is a hardware address assigned to a network interface.
Reference: IEEE MAC Address