Which of the following is a neighbor discovery protocol that sends out and receives detailed Layer 2 network information to other connected access devices and can be used by any vendor?

FCOE (Fibre Channel over Ethernet) is a technology that encapsulates Fibre Channel frames over Ethernet networks, not a neighbor discovery protocol.

LDAP (Lightweight Directory Access Protocol) is an application protocol for accessing and maintaining distributed directory information services, completely unrelated to network neighbor discovery.

CDP (Cisco Discovery Protocol) is a proprietary Layer 2 protocol used by Cisco devices to share information about themselves with other directly connected Cisco devices, and it is not vendor-neutral.

LLDP (Link Layer Discovery Protocol) is an IEEE 802.1AB standard protocol designed for network devices to advertise their identity, capabilities, and other information on a LAN. Unlike proprietary protocols like CDP, LLDP is vendor-neutral, allowing interoperability between different manufacturers' equipment.