Which two (2) situations might require a reverse DNS lookup? (Choose two.)

Which two (2) situations might require a reverse DNS lookup? (Choose two.)
A . If the access log is enabled and a field in the access log requires a hostname
B . If both the primary and alternate forward DNS servers go down
C . If primary authentication fails
D . If a policy trigger event requires it
E . If a forward DNS lookup fails

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Answer: AD