Which two statements are characteristics of a distance vector routing protocol？（）
- ARIP is an example of distance vector routing protocols.
- BUpdates are periodic and include the entire routing table.
- CRouting updates are sent only after topology changes
- DThe protocol can be useful in hub-and-spoke and hierarchical networks.
- EConvergence is usually faster than with link state protocols
- FEach router has its own view of the topology