【单选题】

To a router, a flow is a (71) of packets that share the same characterstics, such as traveling the same (72) , using the same (73) , having the same kind of security, and so on.A、router that suppors the handling of flow labels has a (74) table. The table has an entry for each active flow label; each entry defines the (75) required by the corresponding flow label.

A．flow table
B．flow label
C．rout table
D．tag table