Based on the local label allocation filtering failure, which subnet of prefixes must be selected to meet these requirements?

A service provider is in the process of providing Layer 2 and Layer 3 VPN services through a MPLS LDP-enabled backbone. With load increasing in the service provider domain, scalability become the most important.

Based on the local label allocation filtering failure, which subnet of prefixes must be selected to meet these requirements?
A . CE loopbacks only that are used as BGP next hop
B . PE loopbacks that are used as BGP next hop
C . RR, P, and PE loopbacks that are used as BGP next hop
D . all /32 prefixes advertised in the IGP

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Answer: B