Correct Option: D

The Data Link layer is the second layer of the seven-layer Open Systems Interconnection (OSI) model of computer networking at which meaning is assigned to the bits that are transmitted over the network.Two types of Data Link layer devices are commonly used on networks: bridges and switches. A bridge is an intelligent repeater that is aware of the MAC addresses of the nodes on either side of the bridge and can forward packets accordingly. A switch is an intelligent hub that examines the MAC address of arriving packets in order to determine which port to forward the packet to.