Refer to the exhibit. A mobile transport network with 100,000 routers carries 1 million VPN prefixes. Unified MPLS is deployed on this mobile transport network. Assume that router B is the ABR and it does not have any service VPN attached. How many prefixes does this router B need to hold to ensure that the VPNv4 services are functional end-to-end? 

Answer options:

A. 4,000,000
B. 1,000
C. 400,000
D. 1,000,000
E. 100,000
F. 100

E