Which three network services can be implemented using MPLS within the service provider IP NGN core? (Choose three.)

Which three network services can be implemented using MPLS within the service provider IP NGN core? (Choose three.)
A . Layer 2 VPNs
B . Layer 3 VPNs
C . traffic engineering
D . IntServ traffic engineering tunnels
E . encrypted LSPs

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Answer: A,B,C