What advantage of placing the IS-IS layer 2 flooding domain boundary at the core Layer in a three-layer hierarchical network is true?

What advantage of placing the IS-IS layer 2 flooding domain boundary at the core Layer in a three-layer hierarchical network is true?
A . The Layer 1 and Layer 2 domains can easily overlap
B . It reduces the complexity of the Layer 1 domains
C . It can be applied to any kind of topology
D . The Layer 2 domain is contained and more stable

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Answer: D