Correct Answer - Option 4 : Internetworking
Internetworking is the practice of interconnecting multiple computer networks, such that any pair of hosts in the connected networks can exchange messages irrespective of their hardware-level networking technology. The resulting system of interconnected networks is called internetwork, or simply an internet.
Three types of internetwork addresses are commonly used:
- data-link layer addresses,
- Media Access Control (MAC) addresses, and
- network-layer addresses.
A data-link layer address uniquely identifies each physical network connection of a network device.
Hence the correct answer is Internetworking.