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Rootkits can be classified into different categories according to how they enter a system. What's a kernel-level rootkit?

They attack operating systems that are installed in popcorn-making machines

They attack the level of an operating system that enables users to use specific programs that operate in them

They attack the level of an operating system that enables programs to use hardware components such as CPUs, memory, and input/output devices

They attack the level of an operating system that enables applications to use system calls

Explanation

Detecting Rootkits

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