What are two conditions that can cause UDLD to move an interface into the errdisable state? (Choose two)

What are two conditions that can cause UDLD to move an interface into the errdisable state? (Choose two)
A . A switch receives its own UDLD message on the same port it has sent it from
B . A port in normal UDLD mode fails to receive a UDLD message for a prolonged time period
C . The list of detected neighbors in a received UDLD message is missing the receiving switch ID and port ID combination
D . An ACL denying all IR traffic is applied to a switchport
E . UDLD detects a mismatch between timer settings on neighboring switches

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Answer: AC