单项选择题

Assume that the PEs are separated by Multiple P routers.How many labels should the ingress PE push for BPE functionality？（）

A.1
B.None
C.3
D.2
E.It depends on the numbers of hops between the ingress and egress PE

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CCIE SP

Assume that the PEs are separated by Multiple P routers.How many labels should the ingress PE push for BPE functionality？（）