Which of the following statements about ISIS’ route penetration is correct? (Multiple Choice)

Which of the following statements about ISIS’ route penetration is correct? (Multiple Choice)
A . ISIS routing penetration can be used in |Pv6 environment.
B . ISIS routing penetration can be deployed on Level-1 routers.
C . ISIS’ route penetration does not include aggregated routes.
D . ISIS route penetration does not cause neighbor flapping.
E . ISIS route penetration is used to prevent routing loops.

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Answer: AD