Give reasons why a user would protect a file from read or write access by other users

Give reasons why a user would protect a file from read or
write access by other users and provide examples how this can be done.
-Explain the difference between a virus, a worm, and a Trojan.
-Explain why it is safer for administrators to use two different accounts when working with a computer. Explain the difference between the two accounts.
-Explain how access restrictions on a folder or directory can block a user’s access to a file, even if the file itself may be readable by that user.
-Explain the four general tasks that may play a role in recovering from a security incident

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