Which three statements about L2TPv3 are true？（）

• A、L2TPv3 Frame Relay support includes only 32-bit DLCI addressing
• B、L2TPv3 sessions do not support Frame Relay LMI interworking
• C、Multipoint DLCI is not supported
• D、To use DCE or a Network-to-Network Interface on a Frame Relay port， you must configure the frame-relay switching command
• E、L2TPv3 feature does not support Frame Relay extended addressing