Which of the following can be used to avoid routing loops when RTA generate an autonomy system-external (ASE) link-state advertisement (LSA) and sends it to the CE?

RTA is a provider edge (PE) router. OSPF is deployed between RTA and a customer edge (CE) .

Which of the following can be used to avoid routing loops when RTA generate an autonomy system-external (ASE) link-state advertisement (LSA) and sends it to the CE?
A . Configuring the same VPN route tag on the PE
B . Configuring Shame Link among PEs
C . Setting DN-bit in the ASE LSA
D . Configuring the same domain ID on the PE

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Answer: C, D