Implementing Cisco IP Switched Networks (SWITCH v2-0) (#133)

After UDLD is implemented, a Network Administrator noticed that one port stops receiving UDLD packets. This port continues to reestablish until after eight failed retries. The port then transitions into the errdisable state. Which option describes what causes the port to go into the errdisable state?

Normal UDLD operations that prevent traffic loops.
UDLD port is configured in aggressive mode.
UDLD is enabled globally.
UDLD timers are inconsistent.