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某单位申请到了一个网络地址:12.24.0.0/17,需要划分为4个相同大小的子网。每一个子网的前缀是什么?
A.
12.24.0.0/18, 12.24.64.0/18, 12.24.128.0/18, and 12.24.192.0/18
B.
12.24.0.0/18, 12.24.32.0/18, 12.24.64.0/18, and 12.24.96.0/18
C.
12.24.0.0/19, 12.24.32.0/19, 12.24.64.0/19, and 12.24.96.0/19
D.
12.24.0.0/19, 12.24.64.0/19, 12.24.128.0/19, and 12.24.192.0/19