问题：
[单选题]一个A类网络地址2000，划分子网后，子网掩码为2552552240，下列有效的子网网络地址是（ ）。
A、2.1.16.0
B、2.2.32.0
C、2.3.48.0
D、2.4.172.0
参考答案：
B
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