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Option 3 : 3
Correct option - 3
Practice is a repeated performance or systematic exercise for the purpose of acquiring skills. With reference to the context, we need to understand certain laws that are related with security management. The security word is used for data security on internet or other networks. Hence, replace practice with laws. So, option 3 is the correct answer.
Correct sentence - We need to understand access control systems and methodology, telecommunication and network security, and security managing laws.
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