Which two of these are characteristics of MPLS VPNs?（）

• A、Layer 3 MPLS VPNs can forward only IP packets
• B、Layer 2 MPLS VPNs can forward any network protocol
• C、MPLS label paths are automatically formed based on Layer 2 frames
• D、Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames
• E、In Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies