Which statement about the UDLD protocol is true?

A.
UDLD is a Cisco-proprietary Layer 2 protocol that enables devices to monitor the physical
status of links and detect unidirectional failures.

B.
UDLD is a Cisco-proprietary Layer 2 protocol that enables devices to advertise their identity,
capabilities, and neighbors on a local area network.

C.
UDLD is a standardized Layer 2 protocol that enables devices to monitor the physical status of
links and detect unidirectional failures.

D.
UDLD is a standardized Layer 2 protocol that enables devices to advertise their identity,
capabilities, and neighbors on a local area network.