某公司分为6个部门，其中最大的部门有29台计算机，现申请了一个C类IP地址，要求每个部门在一个子网内，采用子网划分的方式来实现，则子网掩码应设为（）。-问呀课堂

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[单选题]某公司分为6个部门，其中最大的部门有29台计算机，现申请了一个C类IP地址，要求每个部门在一个子网内，采用子网划分的方式来实现，则子网掩码应设为（）。

A255.255.255.0

B255.255.255.128

C255.255.255.192

D255.255.255.224

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