Which of the following is a layer-two protocol used by networked devices to advertize their capabilities?

SMB (Server Message Block) is an application-layer (Layer 7) network file sharing protocol used for providing shared access to files, printers, and serial ports between nodes on a network.

SNMP (Simple Network Management Protocol) is an application-layer (Layer 7) protocol used for managing and monitoring network devices and their functions, not for devices to advertise their capabilities to neighbors.

LLDP (Link Layer Discovery Protocol) is an IEEE standard (802.1AB) Layer 2 protocol that enables network devices, such as switches, routers, and endpoints, to advertise their identity, capabilities, and other information to directly connected neighbors. This information can include device type, port ID, VLAN information, and power management capabilities, which assists in network management and troubleshooting.

FCoE (Fibre Channel over Ethernet) is a storage networking protocol that encapsulates Fibre Channel frames over full-duplex Ethernet networks, operating above Layer 2 but not primarily for advertising device capabilities.