The network consists of a series of routers that are all configured for IBGP. Which one of thefollowing IBGP characteristics is true？（）
- AThe IBGP routers must always be fully meshed
- BThe IBGP routers can be in a different AS
- CThe IBGP routers must be directly connected
- DThe IBGP routers do not need to be directly connected
- ENone of the other alternatives apply are true