Undetected Viruses

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Q: You work as a network security administrator. You suspect that someone has gained access to your machine and used your e-mail account. To uncover potential viruses installed on your computer, you run a full scan. However, you do not find any illegal software. Which of the below security attack types often run in the background on a machine?

a. Rootkit

b. Hybrid

c. Replay

d. Zero-day

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