Which option is a benefit of the distribution layer in a traditional design?

A customer is questioning the additional infrastructure that is needed to design a three-tiered, hierarchical network.

Which option is a benefit of the distribution layer in a traditional design?
A . provides additional security services against unauthorized access
B . extends the Layer 2 and Layer 3 boundary to the core layer
C . isolation of faults between the access and core layers
D . creates access layer resiliency

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Answer: D