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某政府机构拟建设一个网络，委托甲公司承建。甲公司的张工程师带队去进行需求调研，在与委托方会谈过程中记录了大量信息，其中主要内容有：用户计算机数量：80台；业务类型：政务办公，在办公时不允许连接Internet；分布范围：分布在一栋四层楼房内；最远距离：约80米；该网络通过专用光纤与上级机关的政务网相连；网络建设时间：三个月。张工据此撰写了需求分析报告，与常规网络建设的需求分析报告相比，该报告的最大不同之处应该是 (27) 。为此，张工在需求报告中特别强调应增加预算，以采购性能优越的进口设备。该需求分析报告 (28) 。

A. 网络隔离需求
B. 网络速度需求
C. 文件加密需求
D. 邮件安全需求

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