Which statement is true about a Data Center Interconnect over an IP network?

Which statement is true about a Data Center Interconnect over an IP network?
A . Layer 2 data must traverse a point-to-point link.
B . Layer 2 data must traverse an MPLS LS
D . Layer 2 data must be encapsulated.
E . Layer 3 data must be encapsulated.

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Answer: B