Which of the following do you need to take into account when designing IS-IS for an MPLS-VPN environment? (Select two.)

Which of the following do you need to take into account when designing IS-IS for an MPLS-VPN environment? (Select two.)
A . Route leaking is required from L2 to L1 for MPLS (LDP) to work.
B . If MPLS-TE is used, it is simpler to use a single area/Level IS-IS design.
C . If MPLS-TE is used, it is recommended to use a multiarea/Level IS-IS design to achieve more structured architecture.
D . For MPLS to work over IS-IS, IS-IS wide metric must be enabled.
E . Route leaking should be avoided when MPLS and MP-BGP is used.

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Answer: AB