Refer to the exhibit. AS 65500 is running OSPF as its IGP and has two eBGP connections
to the Internet provider AS 65501. The provider requires that you advertise all the prefixes in
AS 65500 to the provider as a single 192.168.12.0/22 route. Currently only Routers A and B
are able to reach the Internet.
Which of the following additions to the configuration is most likely to solve the problem?
Select the best response.

A.
RouterA(config)#ip cef

B.
RouterA(config)#ip route 192.168.12.0 255.255.255.252 null 0

C.
RouterA(config-router)#ebgp multihop 1

D.
RouterA(config-router)#redistribute ospf 1

E.
RouterA(config-router)#neighbor 192.168.14.253 next-hop-self

F.
RouterA(config-router)#neighbor 192.168.14.253 local-as 65500

Explanation:
The synchronization rule states “A BGP router should not use, or advertise to an external
neighbor, a route learned by IBGP, unless that route is local or is learned from the IGP”.
Notice that IGP here can be a static route.
In this case, unless there is an entry about network 192.168.12.0 in the routing table of
RouterA, RouterA will not advertise this network toits EBGP -> B is correct (even if this
static route points to Null0).
Note: Although this question states that OSPF is being used as IGP but for some reasons,
network 192.168.12.0/22 is not advertised to RouterA -> RouterA does not have this route in
its routing table.