Which two statements are true when configuring a domain-id? （）

A.The default OSPF domain-id is 127.0.0.1.

B.In most cases, a domain-id must be configured.

C.In most cases, you do not need to configure a domain-id.

D.For a layer 3 VPN connecting multiple OSPF domains, configuring a domain-id can help control LSA translations.