Which unicast RPF check mode must the operator apply at the border for optimal protection?

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A network has a single exit and is using a default route An operator is worried about denial of service at the network border.

Which unicast RPF check mode must the operator apply at the border for optimal protection?
A . loose mode with allow self ping
B . loose mode
C . strict mode with allow-self-ping
D . strict mode with allow -default option
E . strict mode

Answer: E