A service provider is in process of providing Layer2 and Layer 3 VPN services. After a while the number of Labels across the core have increased and the service provider scalability becomes the most important concern and the ISP decides to allocate label for the necessary prefixes. Which prefixes must be selected to meet requirements?
A. CE loopbacks only that are used as BGP next hop
B. RR, P, and PE loopbacks that are used as BGP next hop
C. PE loopbacks only that are used as BGP next hop
D. P and PE loopbacks that are used as BGP next hop
E. All/32 prefixes advertised in the IGP
