Which two statements are true about IBGP neighbor relationships?（）

• A、The BGP split - horizon rule specifies that routes learned via EBGP are never propagated to other IBGP peers.
• B、The BGP split horizon rule specifies that routes learned via IBGP are never propagated to other IBGP peers.
• C、A full - mesh IBGP requires that neighbor relationships be established between a ll BGP enabled routers in the autonomous system.
• D、IBGP neighbors must be in different autonomous systems.
• E、An EGP or static routing is required between IBGP neighbors.