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IP地址为:192.168.50.70,掩码为:255.255.255.248,则该IP地址所在子网的子网号为()

IP地址为:192.168.50.70,掩码为:255.255.255.248,则该IP地址所在子网的子网号为()
A.192.168.50.32
B.192.168.80.64
C.192.168.50.96
D.192.168.50.71
正确答案:B