Which configuration resolves the issue?

Refer to Exhibit:

AS 111 wanted to use AS 200 as the preferred path for 172.20.5.0/24 and AS 100 as the backup. After the configuration, AS 100 is not used for any other routes .

Which configuration resolves the issue?
A . route-map SETLP permit 10
match ip address prefix-list PLIST1
set local-preference 110
route-map SETLP permit 20
B . route-map SETLP permit 10
match ip address prefix-list PLIST1
set local-preference 99
route-map SETLP permit 20
C . router bgp 111
no neighbor 192.168.10.1 route-map SETLP in neighbor 192.168.20.2 route-map SETLP in
D . router bgp 111
no neighbor 192.169.10.1 route-map SETLP in neighbor 192.168.10.1 route-map SETLP out

View Answer

Answer: B

Explanation:

There is an implicit deny all at the end of any route-map so all other traffic that does not match 172.20.5.0/24 would be dropped. Therefore we have to add a permitsequence at the end of the route-map to allow other traffic.

The default value of Local Preference is 100 and higher value is preferred so we have to set the local preference of AS100 lower than that of AS200.