Which three statements describe the reasons large OSPF networks use a hierarchical design? (Choose three)

Which three statements describe the reasons large OSPF networks use a hierarchical design? (Choose three)
A . to speed up convergence
B . to reduce routing overhead
C . to decrease latency by increasing bandwidth
D . to confine network instability to single areas of the network
E . to lower costs by replacing routers with distribution layer switches
F . to reduce the complexity of router configuration

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Answer: ABD