Refer to the exhibit. 
Which statement is true?
A.
There is an MPLS network that is running 6PE, and the ingress PE router has no mpls ip
propagate-ttl.
B.
There is an MPLS network that is running 6VPE, and the ingress PE router has no mpls ip
propagate-ttl.
C.
There is an MPLS network that is running 6PE or 6VPE, and the ingress PE router has mpls ip
propagate-ttl.
D.
There is an MPLS network that is running 6PE, and the ingress PE router has mpls ip
propagate-ttl.
E.
There is an MPLS network that is running 6VPE, and the ingress PE router has mpls ip
propagate-ttl.
In my opinion D could be better, because the backbone is IPv6 …
What do you think guys?
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