Refer to the exhibit. An engineer is troubleshooting CSC-PE and CSC-CE configurations and finds that there is a missing communication between Layer 3 VPN customer sites that are connected to customer carrier provider.
What is the cause of this issue?
A. The static route configured on CSC-PE1 is missing the vrf keyword on next-hop information.
B. The CSC-PE1 does require knowledge of the Layer 3 VPN customer prefixes in order to allocate and exchange Layer 3 VPN labels with CSC-CE1.
C. The CSC-PE1 device is not allocating labels for the CSC backbone carrier route reflector.
D. The CSC-PE1 and CSC-CE1 routers are not exchanging labeled IPv4 prefixes, which results in LSP blackholing.
E. A CSC design requires selective label allocation.
