民间文学的集体性包含了哪三层意思？

A. 13，21
B. 14，22
C. 13，22
D. 14，21

A. select
B. insert
C. delete
D. update

A. When summarization is configured, the router will also create a route to null 0.
B. The summary route remains in the route table, even if there are no more specific routes to the network.
C. Summarization is configured on a per- interface level.
D. The maximum metric for the specific routes is used as the metric for the summary route.
E. Automatic summarization across major network boundaries is enabled by default.