____ viruses are embedded in a system’s memory so it can be reactivated if the original virus is deleted.

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**Solution:**

1. Resident viruses embed themselves in the system's memory (RAM).
2. This allows them to remain active and infect other files or programs even after the original infected file has been deleted.
3. They can be reactivated from memory if the original virus is removed.

Other types of viruses:
- File viruses infect executable files but do not necessarily embed in memory.
- Polymorphic viruses change their code to avoid detection but do not specifically embed in memory.
- Rootkits are designed to hide the presence of malware but are not the same as resident viruses.

**Answer:** Resident

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