Why do large OSPF networks use a hierarchical design? (choose three)

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

Answer: ACF