答案对吗？ 怎么不选B？

UID: 53601

QUESTION 410
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

UID: 49713

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