Without proper safeguards,every part of a network is vulnerable to a security breach or unauthorized activity from(1),competitor

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问题 Without proper safeguards,every part of a network is vulnerable to a security breach or unauthorized activity from(1),competitors,or even employees.Many of the organizations that manage their own(2)network security and use the Internet for more than just sending/receiving e-mails experience a network(3)一and more than half of these companies do not even know they were attacked.Smaller (4) are often complacent,having gained a false sense of security.They usually react to the last virus or the most recent defacing of their website.But they are trapped in a situation where they do not have the necessary time and (5) to spend on security.
(4)

选项 A、users
B、campuses
C、companies
D、networks

答案C

解析
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