A network specialist is working for a large enterprise that has a BGP-enabled multihomed core
infrastructure. Recently, the ISP that provides Internet connectivity to the company had to
temporarily disable one of the BGP sessions as a result of routers blackholing BGP prefixes in transit.
Which option can the specialist use to avoid this incident in the future?

A.
filtering local prefixes outbound

B.
using only one router as primary BGP speaker

C.
permitting only local prefixes outbound

D.
filtering external prefixes inbound