单选题What is the term "ordered control" mean regarding how MPLS LSPs are established?（）Aestablish starting at the egress router going back to the ingress routerBestablish starting at the ingress router going downstream to the egress routerCestablish when a router learns of a new prefixDestablish when the path correctly matches the reverse path forwarding check
单选题
What is the term "ordered control" mean regarding how MPLS LSPs are established?（）
A
establish starting at the egress router going back to the ingress router
B
establish starting at the ingress router going downstream to the egress router
C
establish when a router learns of a new prefix
D
establish when the path correctly matches the reverse path forwarding check
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