单选题MPLS BGP VPN OSPF超级Backbone实现中，使用以下哪种BGP扩展属性携带OSPF路由类型信息（）。AOSPF Domain Identifier Extended CommunityBOSPF Route Type Extended CommunityCOSPF Router ID Extended CommunityDRoute Distinguisher
单选题
MPLS BGP VPN OSPF超级Backbone实现中，使用以下哪种BGP扩展属性携带OSPF路由类型信息（）。
A
OSPF Domain Identifier Extended Community
B
OSPF Route Type Extended Community
C
OSPF Router ID Extended Community
D
Route Distinguisher
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