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About the description of BGP loop protection, which is correct? (Multiple Choice)

About the description of BGP loop protection, which is correct? (Multiple Choice)
A . For EBGP, the AS-PATH attribute is used to discard any update information received from the EBGP peer that contains its own AS number in the AS-PATH attribute.
B . For IBGP, the BGP router does not advertise any updates from IBGP peers to its IBGP peers.
C . For IBGP, the AS-PATH attribute is used to discard any update information contained in the AS-PATH attribute contained in the AS-PATH attribute from the EBGP peer.
D . For EBGP, the BGP router does not advertise any updates from EBGP peers to its EBGP peers.

Answer: AB

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