E-mail, as well as telephones, _____ an important part in daily communication.

A．is playing

B．have played

C．are playing

D．played

Which routing select algorithm is described below According to a kind of fix regulation, the select algorithm of route works and has nothing to do with the network information newly. ( )

A．Static Routing Algorithm

B．Dynamic Routing Algorithm

C．Centralized Routing Algorithm

D．Distributed Routing Algorithm