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、 MPL S 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