问题：

[多选] 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 policie