What is an important requirement with MPLS applications like Layer 3 MPLS VPNs?

What is an important requirement with MPLS applications like Layer 3 MPLS VPNs?
A . All the PE routers loopback addresses should be summarized to reduce the number of routing table entries in the core routers.
B . Targeted hellos are required between all the PE routers.
C . An end-to-end LSP is required between the PE routers.
D . The LSPs that are built between the PE routers must be symmetrical (bidirectional).

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Answer: C