Which two are advantages of static routing when compared to dynamic routing？（）

A.Security increases because only the network administrator may change the routing tables.
B.Configuration complexity decreases as network size increases.
C.Routing updates are automatically sent to neighbors.
D.Route summarization is compued automatically by the router.
E.Routing traffic load is reduced when used in stub network links.
F.An efficient algorithm is used to build routing tables，using automatic updates.
G.Routing tables adapt automatically to topology changes.