What are two key characteristics of VTP？ （）

• A、VTP messages are sent out all switch-switch connections.
• B、VTP L2 messages are communicated to neighbors using CDP.
• C、VTP manages addition， deletion， and renaming of VLANs 1 to 4094.
• D、VTP pruning restricts flooded traffic， increasing available bandwidth.
• E、VTP V2 can only be used in a domain consisting of V2 capable switches.
• F、VTP V2 performs consistency checks on all sources of VLAN information.