题目内容：
Without proper safeguards,every part of a network is vulnerable to a security breach or unauthorized activity from（71）,competitors,or even employees.Many of the organizations that manage their own（72）network security and use the Internet for more than just sending/receiving e-mails experience a network（73）—and more than half of these companies do not even know they were attacked.Smaller（74）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（75）to spend on security.
A.safeguards
B.businesses
C.experiences
D.resources
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答案解析：