To ensure that the default route received from BGP is advertised into OSPF area 0, the correct configuration must include the command default-information originate under the OSPF routing process. This command allows OSPF to advertise a default route to other OSPF routers. The option that includes this command is Option B, which correctly applies default-information originate always under router ospf 1 configuration mode. The keyword always ensures that the default route is advertised by OSPF even if the router does not have a default route in its routing table. References := Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) v1.1