Exam 300-101 Question id=515 Infrastructure Security

Which option is invalid when configuring Unicast Reverse Path Forwarding?

A. allow self ping to router
B. allow default route
C. allow based on ACL match
D. source reachable via both

WARNING

the answers are mixed, do not specify in the comment number or the letter of the answer
please write answer#A instead A, answer#B instead B...
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