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