单项选择题

Yourcompanyhastwoprimarydivisions：ProductsandServices.T……

Your company has two primary divisions： Products and Services. The Products division is on network 150.10.640/21. The Services division is on network 150.10.72.0/21. You want to summarize both networks into one routing statement. Which IP address and subnet mask combination would most efficiently accomplish this？（）

A. 150.10.64.0/21
B. 150.10.64.0/22
C. 150.10.64.0/20
D. 150.10.0.0./16

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