What does the command udld reset accomplish?

A.
allows a UDLD port to automatically reset when it has been shut down

B.
resets all UDLD enabled ports that have been shutdown

C.
removes all UDLD configurations from interfaces that were globally enabled

D.
removes all UDLD configurations from interfaces that were enabled per-port

Explanation:
When unidirectional link condition is detected the UDLD set port in error-disabled state. To
reinable all ports that UDLD has errdiabled the command:
Switch# udld reset is used.
Reference:
CCNP Self-Study, CCNP BCMSN Official Exam Certification Guide, Fourth Edition,
Protecting Against Sudden Loss of BPDUs, UDLD, p. 251