The following is a partial output configuration of the Huawei router. The correct description about the configuration of this part is:

A . When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will be allowed to advertise routes from 10.0.0.0 to 10.255.255.255.
B . When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will allow advertisement of routes from 172.16.0.0 to 172.31.255.255.
C . When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will filter out the routes from 172.16.0.0 to 172.31.255.255.
D . When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it filters out all routes.

Answer: C