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The core routers within a transit AS are running both IBGP and IGP. The edge routers within the transit AS are using the next-hop-self option to establish the IBGP sessions. What can be implemented to improve the routing performance to all external prefixes?
A. enable route redistribution from BGP into IGP
B. disable BGP synchronization on all the core routers
C. enable CEF on all the core and edge routers
D. enable route redistribution from IGP into BGP
E. use route reflectors within the core