If you partitioned the aggregation and RAN network layers into independent and insolated IGP domains, what will it do?

If you partitioned the aggregation and RAN network layers into independent and insolated IGP domains, what will it do?
A . Cross domain communication will be impossible
B . The Core IGP will not scale
C . it will increase the routing complexity and routing table
D . it will reduce the size of the routing and forwarding tables in the RAN layer

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Answer: D